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OPINION OF THE COURT BY LEVINSON, J. The claimant-appellant Kathleen M. Flor appeals from the decision and order of the State of Hawaii Labor and Industrial Relations Appeals Board (LIRAB),filed on May 25, 1999, and the amended decision and order of the LIRAB, filed on May 28, 1999, affirming the director of labor and industrial relations’ (“theDirector”) denial of compensability of Flor’s workers’ compensation claims and granting summary judgment in favor of the following employer/insurance-carrierappellees (collectively, “the Employers”): Carlos Richard Holguin, D.D.S., and Pacific Insurance Company [hereinafter, Holguin/Pacific]; Douglas H.Dierenfield, D.D.S., and Travelers Insurance Company [hereinafter, Dierenfield/Travelers]; William R. Babbitt, D.D.S., and Pacific Insurance Company[hereinafter, Babbitt/Pacific]; Carlos Richard Holguin, D.D.S., and Island Insurance Company [hereinafter, Holguin/Island]; and William R. Babbitt, D.D.S.,and Crawford And Company [hereinafter, Babbitt/Crawford]. On appeal, Flor raises a single point of error, namely, that the LIRAB erred in denying herworkers’ compensation claims against the Employers under Hawaii Revised Statutes (HRS) ch. 386 [hereinafter, the Workers' Compensation Law] inasmuchas Flor was unable to determine the date on which she acquired the hepatitis C virus. For the reasons explained in this opinion, we agree. We therefore vacatethe LIRAB’s orders and remand to the Director for further proceedings consistent with this opinion, including (1) the determination whether and during whatperiods, if any, Flor was temporarily and/or permanently and partially and/or totally disabled as a result of her hepatitis C and (2) the apportionment of liabilitywith respect to Flor’s workers’ compensation claim among Holguin/Pacific, Dierenfield/Travelers, and Babbitt/Pacific. I. BACKGROUND A. Factual History Flor has worked as a dental hygienist since the 1960s. She has been employed by numerous dentists and periodontists over the course of her career. Flor wasemployed part time by Babbitt from 1987 to 1996, by Dierenfield from 1989 to 1994, and by Holguin from 1991 to 1996. As a dental hygienist, Flor used sharp instruments to clean her patients’ teeth. Her patients bled during the cleaning procedure. Flor sustained numerous “cutsand pokes” by her instruments over the course of her career, including wounds sustained during her employment with Babbitt, Dierenfield, and Holguin. Flor was first treated for symptoms consistent with hepatitis in 1990. However, the hepatitis C test ordered for Flor in December 1990 reflected a negativeresult. Three years later, she was again tested for hepatitis C. On January 12, 1994, the positive results of that test were obtained by the physician whoordered it, although Flor did not learn of her hepatitis C diagnosis until April 17, 1996, after another physician arranged for further tests to be performed.Because of health problems caused by the hepatitis C, Flor ceased working on May 4, 1996. The hepatitis C virus was first identified in 1989, and the first test for the disease was introduced in 1990. The medical evidence adduced by the partiessuggested that symptoms of or abnormalities resulting from hepatitis C may manifest themselves within two to ten weeks after exposure. However, manypatients remain asymptomatic, and the rate of progression of the disease is believed to be highly variable, the average time between infection and advancedliver disease being between ten and twenty years. Numerous physicians opined, by way of letters obtained by the parties and made part of the record in thepresent matter, that Flor’s employment as a dental hygienist was a risk factor, which, in the absence of other risk factors, indicated that Flor probably hadacquired hepatitis C through work exposure to contaminated blood. However, some of the physicians noted risk factors for hepatitis C infection other thanwork exposure to contaminated blood. The physicians’ opinions regarding the timing of Flor’s first exposure to the virus were based upon their view of thestage to which her liver disease had progressed, which suggested that she had probably first acquired the virus in the 1980s or earlier. There was, however, notest or procedure that could reliably isolate either the time of first infection with hepatitis C or the source of the infection. Flor was unable to recall, identify, or otherwise determine the date on which she contracted hepatitis C. She does not contest that she probably contracted thedisease prior to 1990. Responding to the Employers’ requests for admissions, Flor admitted that she possessed no direct or conclusive evidence that she hadbeen exposed to or infected by hepatitis C while in the employ of Babbitt, Dierenfield, or Holguin. B. Procedural History On October 7, 1996, Flor filed separate claims for workers’ compensation benefits against Holguin/Island, Babbitt/Crawford, and Dierenfield/Travelers, [FOOTNOTE 1] allegedly arising out of a work-related injury “occurring” on April 17, 1996. Flor identified her “injury” as hepatitis C. On March 31, 1997, Flor filed separate claims for workers’ compensation benefits against Holguin/Pacific, Dierenfield/Travelers, and Babbitt/Pacific, allegedlyarising out of a work-related injury “occurring” on January 12, 1994. Again, she identified her “injury” as hepatitis C. On December 2, 1997, the Disability Compensation Division of the Department of Labor and Industrial Relations (DLIR) heard Flor’s five consolidatedclaims. On February 5, 1998, the Director rendered a decision denying Flor’s claims on the basis that she “did not suffer any injury on January 12, 1994 orApril 17, 1996, the dates listed as the date of injury on her claims.” Flor filed a timely notice of appeal to the LIRAB on February 17, 1998. On March 23, 1999, Holguin/Pacific filed a motion for summary judgment, alleging that they were entitled to judgment because, inter alia, Flor had admittedthat she had not sustained a work-related injury on January 12, 1994. On March 29, 1999, Babbitt/Crawford filed a separate motion for summary judgmenton the grounds that there was no evidence in the record that Flor had been exposed to the Hepatitis C virus while employed by Babbitt and that she hadcontracted the disease before Crawford’s insurance coverage of Babbitt had commenced. The remaining Employers joined in Holguin/Pacific’s motion. On April 6, 1999, Flor filed a memorandum in opposition to Holguin/Pacific’s motion for summary judgment, asserting both that genuine issues of material factprecluded the entry of summary judgment against her and that, based upon facts that were uncontroverted, [FOOTNOTE 2] she was entitled to a finding that her claim wascompensable. The LIRAB conducted a hearing on the Employers’ motions on April 7, 1999. In a decision and order filed on May 25, 1999, the LIRAB stated: At the outset of the hearing, all of the parties stipulated that there were no genuine issues of material fact as to the issue of whether [Flor's] Hepatitis Ccondition arose out of and in the course of her employment with Drs. Holguin, Babbitt, and/or Dierenfield on January 12, 1994 or on April 17, 1996. All ofthe parties agreed that the issue of compensability was ripe for summary disposition by the [LIRAB]. The parties further stipulated that issues relating to statuteof limitations and notice of claim would not be addressed by the [LIRAB] in ruling on the motions for summary judgment. There being no genuine issue of material fact, we grant the motions for summary judgment in favor of [the Employers] and affirm the Director’s denial ofcompensability of [Flor]‘s claims for injury on January 12, 1994 and/or April 17, 1996. However, the transcript of the hearing does not reflect that any express stipulations were entered on the record, and the record is devoid of any furtherinformation regarding the purported stipulations. The LIRAB entered the following relevant findings of fact (FOFs): 13. [Flor] did not contract Hepatitis C on January 12, 1994, or on April 17, 1996. 14. . . . There is no evidence and [Flor] does not allege that her employment with Holguin/Pacific, or Holguin/Island, or Babbitt/Crawford exposed her toHepatitis C on January 12, 1994, or on April 17, 1996. 15. . . . There is no evidence and [Flor] does not allege that her employment with Dierenfield/Travelers or Babbitt/Pacific exposed her to Hepatitis C onJanuary 12, 1994. 16. [Flor] did not sustain or suffer any injury on January 12, 1994, or on April 17, 1996. The LIRAB entered a single conclusion of law (COL), as follows: [W]e conclude that [Flor] did not sustain a personal injury on or about January 12, 1994, arising out of and in the course of her employment with Dr.Dierenfield or Dr. Babbitt. We further conclude that [Flor] did not sustain a personal injury on or about April 17, 1996, arising out of and in the course of heremployment with Dr. Holguin or Dr. Babbitt. [Flor's] claims against Holguin/Pacific, Holguin/Island, Babbitt/Crawford, and Babbitt/Pacific, andDierenfield/Travelers were properly denied. On May 28, 1999, the LIRAB amended its COL to state that “[Flor] did not sustain a personal injury on or about January 12, 1994, arising out of and in thecourse of her employment with Dr. Dierenfield, Dr. Babbitt, or Dr. Holguin.” (Emphasis in original.) Flor filed a timely notice of appeal to this court on June 25, 1999. II. STANDARDS OF REVIEW A. Agency Decisions Appellate review of the LIRAB’s decision is governed by Hawaii Revised Statutes (HRS) � 91-14(g) (1993), which provides: Upon review of the record the court may affirm the decision of the agency or remand the case with instructions for further proceedings; or it may reverse ormodify the decision and order if the substantial rights of the petitioners may have been prejudiced because the administrative findings, conclusions, decisions, ororders are: (1) In violation of constitutional or statutory provisions; or (2) In excess of the statutory authority or jurisdiction of the agency; or (3) Made upon unlawful procedure; or (4) Affected by other error of law; or (5) Clearly erroneous in view of the reliable, probative, and substantial evidence on the whole record; or (6) Arbitrary, or capricious, or characterized by abuse of discretion or clearly unwarranted exercise of discretion. HRS � 91-14(g). “Under HRS � 91-14(g), [COLs] are reviewable under subsections (1), (2), and (4); questions regarding procedural defects are reviewableunder subsection [FOOTNOTE 3][.]” Potter v. Hawaii Newspaper Agency, 89 Hawaii 411, 422, 974 P.2d 51, 62 (1999) (quoting Korean Buddhist Dae Won SaTemple v. Sullivan, 87 Hawaii 217, 229, 953 P.2d 1315, 1327 (1998) (quoting Konno v. County of Hawaii, 85 Hawaii 61, 77, 937 P.2d 397, 413 (1997)(quoting Bragg v. State Farm Mutual Auto Ins., 81 Hawaii 302, 305, 916 P.2d 1203, 1206 (1996)))). A [COL] . . . is not binding on an appellate court and is freely reviewable for its correctness. Thus, the court reviews [COLs] de novo, under the right/wrongstandard. Bumanglag v. Oahu Sugar Co., Ltd., 78 Hawaii 275, 279, 892 P.2d 468, 472 (1995) (quoting Tate v. GTE Hawaiian Tel. Co., 77 Hawaii 100, 102-03,881 P.2d 1246, 1248-49 (1994) (brackets in original)). Kahana Sunset Owners Ass’n v. County of Maui, 86 Hawaii 66, 68-69, 947 P.2d 378, 380-81 (1997) (some brackets added and some in original). B. Statutory Interpretation “[T]he interpretation of a statute . . . is a question of law reviewable de novo.” State v. Arceo, 84 Hawaii 1, 10, 928 P.2d 843, 852 (1996) (quoting State v.Camara, 81 Hawaii 324, 329, 916 P.2d 1225, 1230 (1996) (citations omitted)). See also State v. Toyomura, 80 Hawaii 8, 18, 904 P.2d 893, 903 (1995);State v. Higa, 79 Hawaii 1, 3, 897 P.2d 928, 930, reconsideration denied, 79 Hawaii 341, 902 P.2d 976 (1995); State v. Nakata, 76 Hawaii 360, 365,878 P.2d 669, 704, reconsideration denied, 76 Hawaii 453, 879 P.2d 556 (1994), cert. denied, 513 U.S. 1147, 115 S.Ct. 1095, 130 L.Ed.2d 1063(1995). Gray v. Administrative Director of the Court, 84 Hawaii 138, 144, 931 P.2d 580, 586 (1997) (some brackets added and some in original). See also State v.Soto, 84 Hawaii 229, 236, 933 P.2d 66, 73 (1997). Furthermore, our statutory construction is guided by established rules: When construing a statute, our foremost obligation is to ascertain and give effect to the intention of the legislature, which is to be obtained primarily from thelanguage contained in the statute itself. And we must read statutory language in the context of the entire statute and construe it in a manner consistent with itspurpose. . . . . Gray, 84 Hawaii at 148, 931 P.2d at 590 (quoting State v. Toyomura, 80 Hawaii 8, 18-19, 904 P.2d 893, 903-04 (1995)) . . . (footnote omitted). Thiscourt may also consider “[t]he reason and spirit of the law, and the cause which induced the legislature to enact it . . . to discover its true meaning.” HRS� 1-15(2) (1993). State v. Kotis, 91 Hawaii 319, 327, 984 P.2d 78, 86 (1999) (citations omitted) (some ellipsis points added and some in original). III. DISCUSSION A. Compensability Of Injuries Caused By Occupational Disease Under The Workers’ Compensation Law The term “occupational disease” does not appear in the Workers’ Compensation Law. Although our statute does not specifically have any provision regarding occupational disease, as do the workmen’s compensation acts of many States, anexamination of these decisions is interesting and instructive because, in substance, we have the same law where the disease is “proximately caused by theemployment.” (R. L. H. 1955, � 97-3.[ (3)]) “It is common knowledge that pulmonary tuberculosis is a disease to which the general public is exposed and it is not peculiarly an occupational disease in thesense that the courts have come to regard silicosis or painter’s lead poisoning, as examples. It may become an occupational disease, however, if it appears tohave had its origin in a risk connected with the employment and to have flowed from that source as a consequence. It seems obvious that if one is employed ina sanatorium for the treatment of tuberculosis, contraction of the disease is a hazard to which the workman would not have been equally exposed outside theemployment and therefore the disease is incidental to the business and not independent of the relation of the employer and employee.” (Evans v. Indiana Univ.Medical Center, 100 N. E. [2d] 828, 121 Ind. App. 678 [1951].) The court stated that if the industrial board had found that the claimant contracted tuberculosis during the course of employment, there was ample evidence tosustain such finding. There are numerous other cases similarly holding tuberculosis is an occupational disease where it can be shown that the employee is more exposed than thegeneral public. (Gray v. City of St. Paul, 84 N. W. [2d] 606; Board of National Missions v. Alaska Industrial Board, 116 F. Supp. 625, and cases citedtherein.) Fukuoka v. Dodo, 43 Haw. 337, 343 (1959) (brackets in original). The foregoing observations, made in the context of the workers’ compensation claim of amortuary employee who had contracted tuberculosis, apply equally to Flor’s hepatitis C claim under the contemporary counterpart of R.L.H. � 97-3 (1955),i.e., HRS � 386-3 (1993 & Supp. 1999). [FOOTNOTE 4] The case law of other jurisdictions recognizing hepatitis C as an occupational disease includes Muir v. Bard, 519S.E.2d 583 (S.C. Ct. App. 1999) (hepatitis C was occupational disease for worker who examined failed catheters, some of which were bloody);Bloomington Hospital v. Stofko, 705 N.E.2d 515 (Ind. Ct. App. 1999) (hepatitis C was occupational disease for hospital employee); Price v. City of NewOrleans, 672 So.2d 1045 (La. Ct. App. 1996) (hepatitis C contracted by fire fighter was occupational disease); Jeanette District Memorial Hospital vWorkmen’s Compensation Appeal Board, 668 A.2d 249 (Pa. Commw. Ct. 1995) (statute provided that “serum hepatitis” was occupational disease, therebyraising presumption that registered nurse infected with hepatitis C suffered work-related disability); Fairfax County v. Espinola, 396 S.E.2d 856 (Va. Ct. App.1990) (non-A and non-B hepatitis, i.e. hepatitis C, was occupational disease for police department technician exposed to blood products through blood andbreathalyzer tests); but see Wheaton v. City of Tulsa Fire Department, 970 P.2d 194 (Okla. Ct. App. 1998) (hepatitis C contracted by fire fighter was notoccupational disease under Oklahoma workers’ compensation law, but could be compensable accidental injury based on repeated exposures to disease whilemoving injured individuals, even though claimant could not determine the precise exposure that caused him to contract disease). Hepatitis has been expresslyrecognized as an occupational disease for dental hygienists. Sirkin and Levine v. Timmons, 652 A.2d 1079 (Del. Super. Ct. 1994); Hansen v. Gordon, 602A.2d 560 (Conn. 1992). [FOOTNOTE 5] An accidental injury is distinguished from an occupational disease in that the former generally results from a discrete event — the time and place of which canbe fixed –, while the latter generally develops gradually over a long period of time. Booker v. Duke Medical Center, 256 S.E.2d 189, 197 (N.C. 1979).When a disease causing injury results from an identifiable accident, rather than from a peculiar risk of the employment, it should be compensated as anaccidental injury. Baldwin v. Jensen-Salsbery Laboratories, 708 P.2d 556, 557-58 (Kan. Ct. App. 1985) (maintenance worker in plant contaminated bybrucella cultures — who cut hand on sheet of metal retrieved from floor tool that had fallen into liquid containing brucella and who became ill with brucellosistwo weeks later — held to have contracted brucellosis by accident) (citing Wilson Foods Corp. v. Porter, 467 P.2d 480 (Okla. 1980)). See also Booker, 256S.E.2d 189, 198 (holding that “[i]f an employee contracts an infectious disease as a result of his employment and it falls within either the schedule of diseasesset out in the statute or the general definition of ‘occupational disease’ . . . , it should be treated as a compensable event regardless of the fact that it might alsoqualify as an ‘injury by accident,’” and ruling that hepatitis contracted by laboratory technician was compensable occupational disease). As noted supra at note 4, HRS � 386-3 provides in relevant part that “[i]f an employee suffers personal injury . . . by disease proximately caused by orresulting from the nature of the employment, the employee’s employer or the special compensation fund shall pay compensation to the employee[.]“ We have traditionally construed HRS � 386-3 liberally in favor of conferring compensation because our “‘legislature has decided that work injuries are amongthe costs of production which industry is required to bear[.]‘” Chung v. Animal Clinic, Inc., 63 Haw. 642, 649, 636 P.2d 721, 726 (1981) (quoting Akaminev. Hawaiian Packing & Crating Co., 53 Haw. 406, 409, 495 P.2d 1164, 1166 (1972)); Royal State Nat’l Ins. Co. v. Labor and Indus. Relations Appeal Bd.,53 Haw. 32, 38, 487 P.2d 278, 282 (1971); see also Larson, 1B Workmen’s Compensation Law, � 43.51 (1993) [hereinafter, Larson] (“The theory of[workers'] compensation legislation is that the cost of all industrial accidents should be borne by the customer as a part of the cost of the product. It followsthat any worker whose services form a regular and continuing part of the cost of that product . . . is within the presumptive area of intended protection.”). Moreover, “[workers'] compensation laws are highly remedial in character. Their paramount purpose is to provide compensation for an employee for allwork-connected injuries, regardless of questions of negligence and proximate cause. Courts should therefore give them a liberal construction in order toaccomplish their beneficent purposes.” Evanson v. University of Hawaii, 52 Haw. 595, 600, 483 P.2d 187, 191 (1971) (emphasis added) (citations omitted). Mitchell v. State Dep’t of Educ., 85 Hawaii 250, 255, 942 P.2d 514, 519 (1997) (footnote omitted). Furthermore, HRS � 386-85 (1993) provides in relevant part that “[i]n any proceeding for the enforcement of a claim for compensation under this chapter itshall be presumed, in the absence of substantial evidence to the contrary: (1) [t]hat the claim is for a covered work injury.” HRS � 386-1 (1993) defines “workinjury” as “a personal injury suffered under the conditions specified in section 386-3,” see supra note 4. This statutory presumption in favor of compensabilitysupports the liberal construction of the Workers’ Compensation Law. Ostrowski v. Wasa Elec. Services, Inc., 87 Hawaii 492, 496, 960 P.2d 162, 166(App. 1998). The presumption has been described as one of the “keystone principles” of our workers’ compensation plan. Iddings v. Mee-Lee, 82 Hawaii 1,22, 919 P.2d 263, 284 (1996) (Ramil, J., dissenting). HRS � 386-85(1) creates a presumption in favor of the claimant that the subject injury is causally related to the employment activity. As we previouslyexplained in Akamine, this presumption imposes upon the employer both the heavy burden of persuasion and the burden of going forward with the evidence.53 Haw. at 408, 495 P.2d at 1166. The claimant must prevail if the employer fails to adduce substantial evidence that the injury is unrelated to employment.The term “substantial evidence” signifies a high quantum of evidence which, at the minimum, must be “relevant and credible evidence of a quality and quantitysufficient to justify a conclusion by a reasonable man that an injury or death is not work connected.” Id. at 408-9, 495 P.2d at 1166; Survivors of TimothyFreitas v. Pacific Contractors Co., 1 Haw. App. 77, 85, 613 P.2d 927, 933 (1980). The statute nowhere requires, as appellants suggest, some preliminary showing that the injury occurred “in the course of employment” before the presumptionwill be triggered. Rather, HRS � 386-85 clearly dictates that coverage will be presumed at the outset, subject to being rebutted by substantial evidence to thecontrary. This is so in all claims proceedings, regardless of the existence of conflicting evidence, as the legislature has determined that where there is areasonable doubt as to whether an injury is work-connected, it must be resolved in favor of the claimant. Akamine, supra at 409, 495 P.2d at 1166. Chung, 63 Haw. at 650-51, 636 P.2d at 726-27. In addition to the presumption of compensability, “the broad humanitarian purpose of the workers’ compensation statute read as a whole requires that allreasonable doubts be resolved in favor of the claimant,” DeFries v. Ass’n of Owners, [57 Haw. 296,] 304, 555 P.2d [855,] 860 [(1976)] (emphasis inoriginal), for diseases arising from the nature of the employment are among the costs of production which industry must bear. See Akamine v. HawaiianPacking, supra, 53 Haw. at 409, 495 P.2d at 1166. Thus, an injury is compensable if it reasonably appears to have resulted from the working conditions. Lawhead v. United Airlines, 59 Haw. 551, 560, 584 P.2d 119, 125 (1978) (holding that “a disease or illness such as influenza is an injury within the meaningof HRS � 386-3″). Liberal construction and the presumption of compensability notwithstanding, workers’ compensation law conditions an employer’s liability for an employee’sinjury upon the injury’s causal “nexus” to the job. See, e.g., Holt v. Acme Mattress Co. & London Guarantee & Accident Co., 40 Haw. 660, 670, 675(1955) (recognizing that “[t]he basic current problem in this area . . . is the extremely difficult medico-legal question of causation” and that “[t]he workmen’scompensation law is not designed as a complete substitute for life insurance, or sick and accident insurance, for employees, nor can sympathy be allowed tobroaden its express statutory provisions”) (citations and internal quotation marks omitted). This court has held that [f]or an injury to be compensable under a workers’ compensation statute, there must be a requisite nexus between the employment and the injury. The nexusrequirement is articulated in Hawaii, as in the majority of jurisdictions, on the basis that, to be compensable, an injury must arise out of and in the course ofemployment. Tate v. GTE Hawaiian Tel. Co., 77 Hawaii 100, 103, 881 P.2d 1246, 1249 (1994) (footnote omitted). In Tate, we explained that, in determining whether aninjury meets this criterion, the court has adopted a “unitary” test that considers whether there is a sufficient work connection to bring the accident within the scope of the statute. Firstarticulated in Royal State National Insurance Co. v. Labor and Industrial Relations Appeal Board, 53 Haw. 32, 487 P.2d 278 (1971), the work connectionapproach simply requires the finding of a causal connection between the injury and any incidents or conditions of employment. Chung, 63 Haw. at 648, 636P.2d at 725 (citations omitted). Id. HRS � 386-3 provides that an injury “by accident” is compensable when the accident arises “out of or in the scope of the employment,” but an injury “bydisease” is compensable when the disease is “proximately caused by or resulting from the nature of the employment.” Thus, the “nexus” requirement articulatedin Tate, see supra, traces the language of the “injury-by-accident” prong of HRS � 386-3. Similarly, the “work connection” requirement, as articulated in Tate,expressly pertains to accidental injury. As far as we can determine, however, this court has never before construed the causation requirements applicable tothe “injury-by-disease” prong of HRS � 386-3. A disease “resulting from the nature of the employment” is, by definition, an “occupational disease.” See Komatsu v. Board of Trustees, Employees’ RetirementSystem, 5 Haw. App. 279, 284, 687 P.2d 1340, 1344 (1984) (“[A]n occupational disease is one ‘which results from the nature of the employment, and bynature is meant . . . conditions to which all employees of a class are subject, and which produce the disease as natural incident of a particular occupation, andattach to that occupation a hazard which distinguishes it from the usual run of occupations and is in excess of the hazard attending employment in general.’”)(Quoting Harman v. Republic Aviation Corp., 82 N.E.2d 785, 786 (N.Y. 1948).) (Quoting Goldberg v. 954 Marcy Corp., 12 N.E.2d 311, 313 (N.Y.1938).)) (Ellipsis points and brackets in original.), vacated on other grounds, 67 Haw. 485, 693 P.2d 405 (1984); see also Department of Labor andIndustries v. Kinville, 664 P.2d 1311, 1314-15 (Wash. Ct. App. 1983) (interpreting statute defining “occupational disease” as one arising “naturally andproximately” out of employment). Thus, injuries caused by an “occupational disease” are compensable pursuant to HRS � 386-3. However, “[a]n ailment does not become an occupational disease simply because it is contracted on the employer’s premises. . . . There must be arecognizable link between the disease and some distinctive feature of the claimant’s job, common to all jobs of that sort.” Anderson v. General Motors Corp.,442 A.2d 1359, 1360 (Del. 1982) (quoting Herman, 82 N.E.2d at 786). In other words, an ailment or disease is a compensable occupational disease if “theemployer’s working conditions produced the ailment as a natural incident of the employee’s occupation in such a manner as to attach a hazard distinct from andgreater than the hazard attending employment in general.” Id. at 1361. See also Wood v. Harry Harmon Insulation, 511 So. 2d 690 (Fla. Dist. Ct. App.1987) (to be compensable under occupational disease theory, disease must (1) actually be caused by employment conditions that are characteristic of andpeculiar to particular occupation, (2) actually be contracted during employment in that occupation, and (3) have incidence substantially higher in thatoccupation than in usual occupations or, in case of ordinary disease of life, in general population); Muir, 519 S.E.2d at 591-92 (workers’ compensationbenefits for having contracted occupational disease are available, inter alia, when disease (1) is due to hazards in excess of those that are ordinarily incident toemployment in general, (2) is peculiar to occupation in which claimant was engaged, and (3) results from claimant’s actual exposure to working conditions ofthat occupation); Hansen, 602 A.2d at 562 (occupational disease is any disease (1) peculiar to the occupation in which employee was engaged and (2) due tocauses in excess of ordinary employment as such, and it is compensable if it originated while employee was engaged in line of duty for employer); Booker, 256S.E.2d at 196 (for occupational disease to be compensable under North Carolina statute, it (1) must have been due to causes and conditions that werecharacteristic of and peculiar to particular trade, occupation, or employment, (2) could not have been ordinary disease of life to which general public wasequally exposed outside of that employment, and (3) must have been causally connected with that employment, which could be determined by circumstantialevidence such as extent of exposure to disease during employment, compared with exposure outside of employment and absence of disease prior towork-related exposure). We hold that an employee’s injury caused by a disease is compensable as an “injury by disease,” pursuant to HRS � 386-3, when the disease (1) is caused byconditions that are characteristic of or peculiar to the particular trade, occupation, or employment, Booker, 256 S.E.2d at 196; Wood, 511 So.2d at 692, (2)results from the employee’s actual exposure to such working conditions, Muir, 519 S.E.2d at 592, and (3) is due to causes in excess of the ordinary hazards ofemployment in general, Hansen, 602 A.2d at 562. In this connection, and pursuant to HRS � 386-85, the burden is on the employer seeking to avoid liabilityto demonstrate by substantial evidence that these conditions are not present. B. The “Date of Injury” In Occupational Disease Claims Under The Workers’ Compensation Law HRS � 386-82 (1993) [FOOTNOTE 6] establishes the time within which a claimant must file a claim under the Workers’ Compensation Law. In Hayashi v. Scott Company, No. 21877, slip op. (Haw. March 14, 2000), wereiterated that, pursuant to HRS � 386-82, “‘the time period for notice or claim does not begin to run until the claimant, as a reasonable [person], shouldrecognize the nature, seriousness and probable compensable character of his injury or disease.’” Slip op. at 8 (quoting Demond v. University of Hawaii, 54Haw. 98, 104, 503 P.2d 434, 438 (1972)) (brackets in original). The Employers in the present matter initially contended that Flor’s claims were untimely filed. For reasons not disclosed by the record, the parties stipulatedthat the LIRAB would not resolve the timeliness issue in its ruling on the Employers’ motions for summary judgment. Nevertheless, we note that the statute oflimitations on Flor’s claims would not have begun to run until her discovery that she had contracted hepatitis C, see Hayashi, supra, which, she asserts,occurred on April 17, 1996 — Flor’s self-identified date of “injury” for purposes of filing her claims. Occupational disease cases typically show a long history of exposure without actual disability, culminating in the enforced cessation of work on a definite date.In the search for an identifiable instant in time which can perform such necessary functions as to start claim periods running, establish claimant’s right to benefits,determine which year’s statute applies, and fix the employer and insurer liable for compensation, the date of disability has been found the most satisfactory.Legally, it is the moment at which the right to benefits accrues; as to limitations, it is the moment at which in most instances the claimant ought to know he has acompensable claim; and, as to successive insurers, it has the one cardinal merit of being definite, while such other possible dates as that of the actualcontraction of the disease are usually not susceptible to positive demonstration. Lowery v. McCormick Asbestos Co., 475 A.2d 1168, 1174 (Md. 1984) (quoting Larson, � 95.21 (1981)) (emphasis added). Flor did not actually cease working until May 4, 1996. Thus, her “date of disability,” as construed pursuant to Lowery, would be May 4, 1996. Flor herselfdesignated May 4, 1996 as the “date disability began.” However, April 17, 1996 was the date on which Flor recognized the “nature, seriousness[,] andprobable compensable character,” Hayashi, slip op. at 8, of her disease. It is undisputed that her ultimate cessation of work was “enforced” by her hepatitis C.The Hansen court noted that hepatitis “itself is an impairment in capacity because it disabled [the] claimant from employment as a dental hygienist and thereforecaused her to lose earnings.” Hansen, 602 A.2d at 566. In the present case, the LIRAB entered no express FOFs as to the effect of Flor’s April 17, 1996discovery of her diagnosis on her employability. However, even if the diagnosis did not directly precipitate the cessation of her employment, the recordreflects, at the very least, that the diagnosis contributed to Flor’s retirement, inasmuch as her physicians recommended that she cease working. The date on which a claimant becomes totally disabled is a question of fact for the referee to determine on the basis of the evidence. Novak v. Mathies CoalCo., [370 A.2d 435, 436-37 (Pa. Commw. Ct. 1977)]. The date disability begins is not automatically the date of last exposure [to an occupational hazard] orthe date on which claimant is examined and determined by his doctor to be disabled. . . . Novak v. Mathies Coal Co., supra. Gateway Coal Co. v. Workmen’s Compensation Appeals Board, 388 A.2d 1122, 1124 (Pa. Commw. Ct. 1978). The [worker's compensation] board may set as the date of disablement the date on which physical impairment in the nature of occupational disease wasdiagnosed. Where no medical finding of occupational disease is initially made but such condition is established upon later diagnosis, the board may properly setthe date of the later diagnosis as the date of disability. Barnett v. Edmur Baking, Inc., 322 N.Y.S.2d 473, 475 (N.Y. App. Div. 1971) (citing Zambrona v. Renell Bake Shop, Inc., 309 N.Y.S.2d 758, 760 (N.Y.App. Div. 1970)). See also Liberty Mut. Ins. Co. v. Commercial Union Ins. Co., 978 F.2d 750, 758-59 (1st Cir. 1992) (holding that, for purposes ofLongshore and Harbor Workers’ Compensation Act (LHWCA), 33 U.S.C. �� 901-950 (1988), liability for effects of occupational disease falls upon lastresponsible insurer on date of disability, as determined by date of decreased earning capacity, which may coincide with date of diagnosis despite absence ofoutward physical symptoms). The determination of the precise date on which a claimant has become disabled due to an occupational disease is a factual determination to be made by theDirector based on the circumstances of each case. However, the record in the present matter indicates that Flor’s cessation of work was directly related to herdiscovery of her hepatitis C diagnosis on April 17, 1996, and, accordingly, the Director may consider that date to be Flor’s “date of disability” for purposes ofestablishing (1) the statute of limitations period applicable to her claims pursuant to HRS � 386-82, (2) the date on which her right to benefits began to accruefor purposes of computing her weekly permanent disability benefit rate, as prescribed in HRS � 386-31 (1993) and (3) which year’s version of the Workers’Compensation Law is applicable. Lowery, 475 A.2d at 1174. [FOOTNOTE 7] It is generally held under workmen’s compensation acts that injury results when the right to compensation arises. Injury and compensable disability are more inthe nature of synonymous terms than are date of injury and date of the accident. Thus, in Esposito v. Marlin-Rockwell Corp., [114 A. 92, 94 (Conn. 1921)],it is said: “A compensable injury is an injury for which compensation is payable, and the date of such an injury is not the time of the accident or occurrencecausing the injury, but the time . . . when the right to compensation accrues.” In Re Palama, 34 Haw. 65, 71 (1937) (quoting Acme Body Works v. Koepsel, 234 N.W. 756, 758 (Wis. 1931)). We hold that a claimant in a case arising under the “injury-by-disease” prong of HRS � 386-3 may rely upon the foregoing “date of disability,” which typicallyis the last day of employment but, as indicated supra, may also be the date of diagnosis of the disabling condition, in order to identify the “date of injury”required by the DLIR in connection with the filing of a workers’ compensation claim. Flor was therefore justified in identifying either the date on which shelearned of her diagnosis (i.e., April 17, 1996) or the date on which she ceased working (i.e., May 4, 1996) as the “date of injury” on her claim form. Cf.Nelson v. Industrial Comm’n, 585 P.2d 887, 890-91 (Ariz. Ct. App. 1978) (holding that “the ‘date of injury’ in an occupational disease claim must be viewedas the date the claimant, in the exercise of reasonable diligence, discovers a relationship between a disabling condition and employment”); Chavira v. Workers’Compensation Appeals Bd., 286 Cal. Rptr. 600, 605-06 (Cal. Ct. App. 1991) (noting legislative codification of proposition that, “in the case of a progressiveoccupational disease, the date of injury is the date on which disability occurs and by reasonable diligence the employee can discover the disability wasindustrially caused”); King v. District of Columbia Dep’t of Employment Servs., 742 A.2d 460, 471-72 (D.C. 1999) (noting that Railco Multi-ConstructionCo. v. Gardner, 564 A.2d 1167, 1168 (D.C. 1989), “adopted a rule that the time of injury is normally deemed to be when the employee is first aware of theinjury and its relationship to the employment”); Garcia v. Travelers Indem. Co. of Rhode Island, 892 F. Supp. 153, 157 (W.D. Tex. 1995) (quoting Texaslabor code for proposition that “the date of injury for an occupational disease is the date on which the employee knew or should have known that the diseasemay be related to the employment”). On remand, the Director will be required to determine Flor’s “date of disability” for the purposes enumerated in this section. However, regardless of theoutcome of that determination, Flor’s workers’ compensation claim was not foreclosed by the fact that she identified a different date as the “date of injury” onher claim form. C. Application Of The Workers’ Compensation Law To Flor’s Occupational Disease Claim Because Flor did not press the fiction that she had actually contracted hepatitis C either on April 17, 1996 or on January 12, 1994 (i.e., second date that Florinitially identified on her claim form as the “injury date”), and becauseshe was, in fact, willing to acknowledge that she had not contracted the virus on those dates, the LIRAB found that Flor “did not sustain or suffer any injury”on either of those dates. The LIRAB therefore mechanistically concluded, a fortiori, that Flor had not sustained an injury “arising out of or in the course of heremployment” with the Employers on those dates and that, as a consequence, the Employers were entitled to summary judgment against Flor on her workers’compensation claims. In doing so, the LIRAB erred for several reasons. First, as we have noted, an injury caused by a disease is compensable under the Workers’ Compensation Law when the disease is “proximately caused by orresult[s] from the nature of the employment.” See HRS 386-3, supra note 4. The statute does not speak of injuries generically “arising out of and in the courseof employment,” but, rather, of “personal injury . . . by accident . . . or by disease.” Id. The distinction between the injury itself and the occurrence giving rise toit may not be significant when the occurrence is an “accident” because the injury generally manifests itself contemporaneously with the accident causing it.However, the distinction is critical when the occurrence gives rise to a disease. As we indicated supra in section III.A, a worker’s compensation claimpremised on a disease such as hepatitis C, should, in general, be deemed an “injury-by-disease” claim. The LIRAB’s COL treated Flor’s “injury by disease”claim as if it involved an “injury by accident.” Second, the LIRAB erred in finding that there was no genuine issue of material fact as to whether Flor had suffered an “injury” on April 17, 1996, inasmuch asthe factual questions regarding the relationship between Flor’s hepatitis C diagnosis and both her employability as a dental hygienist and her ability to work ingeneral were not resolved. Moreover, as discussed supra in section III.B, Flor’s workers’ compensation claim was not foreclosed merely because she assertedthat the date on which she discovered her disease was the date of injury. Third, the LIRAB mistakenly assumed that the unknown date on which Flor first contracted the hepatitis C virus was the “date of injury.” Obviously, thecontracting of a virus does not, in and of itself, constitute a compensable injury. A compensable injury — i.e., a disability from work — typically occurs wellafter the virus has first entered the claimant’s bloodstream. This is especially true in the case of a virus, such as hepatitis C, that remains asymptomatic fordecades and, indeed, may never manifest itself. Accordingly, whether Flor contracted the virus on the precise date of her claimed injury is not dispositive of thecompensability of her claim. Finally, fourth, the LIRAB failed to apply the statutory presumption, set forth in HRS � 386-85, in favor of the compensability of Flor’s claim. In thisconnection, the medical opinions adduced by the parties corroborated, rather than rebutted, the proposition that Flor’s risk of contracting hepatitis C as adental hygienist exceeded the risk of contracting the disease by virtue of employment or life in general. Moreover, the medical opinions proffered by theEmployers suggested, at most, an inability to pinpoint the precise cause of Flor’s hepatitis C. Such opinions were insufficient to rebut the presumption thatFlor’s employment as a dental hygienist contributed to the development of her disease. See Jeanette District Memorial Hospital, 668 A.2d at 251-52(evidence that hospital nurse suffered hepatitis C raised rebuttable presumption that her disability was work-related, and presumption was not rebutted byexpert testimony of hospital’s witnesses that they were unable to determine cause of claimant’s illness); see also Akamine, 53 Haw. at 409-15, 495 P.2d at1167-68 (physician’s testimony that (1) heart diseases originate relatively early in life, (2) pre-existing pathological conditions must have spurred claimant’sheart attack, and (3) heart attack could just as well have occurred elsewhere than at work did not rebut presumption of compensability when physiciantestified that he did not know whether heart attack was related to claimant’s work activity). In fact, some of the physicians’ proffered opinions acknowledgedthat Flor probably acquired the virus by virtue of her employment as a dental hygienist. Accordingly, the Employers failed to carry their burden ofdemonstrating by substantial evidence that Flor’s claim was not compensable. That being the case, we hold that Flor’s disability, caused by hepatitis C, iscompensable under the Workers’ Compensation Law, inasmuch as the Employers failed to demonstrate by substantial evidence that Flor’s disease (1) was notcaused by conditions that were characteristic of or peculiar to her employment as a dental hygienist, (2) did not result from her actual exposure to suchconditions, and (3) was not due to causes in excess of the ordinary hazards of employment in general. See supra section III.A. Nevertheless, the Employers argue that, because some of the physicians opined that Flor probably acquired the virus during the early 1980s — or even in the1970s –, the employers for whom Flor commenced employment after those time periods lacked a sufficient connection with her disability to be liable for thepayment of any workers’ compensation benefits. This argument would more properly be raised by the Employers in a proceeding regarding allocation ofliability among Flor’s employers and/or the Special Compensation Fund, see infra note 10, for her compensation. However, we offer the followingobservations: “[A] medical man may give a generalized opinion that there was no connection between an incident at work and a heart attack, and, in his own mind, maymean thereby that a pre-existing pathological condition was the overwhelming factor in bringing about the attack and that the part played by the work wasinsignificant. But, while it may be sound medically to say that the work did not ’cause’ the attack, it may well be bad law, because, in general, existing law treatsthe slightest factor of aggravation as an adequate ’cause.’” McNiece, Heart Disease and the Law 135 (1961). [Akamine,] 53 Haw. at 410, 495 P.2d at 1167. The primary focus of medical testimony for the purposes of determining legal causation should be whether theemployment situation in any way contributed to the employee’s injury. Id. at 412, 495 P.2d at 1168. Testimony that a pre-existing heart disease may havebeen a contributing or precipitating cause of the heart attack should be accorded little probative weight. Id. The only relevant inquiry is whether [claimant's]heart attack in fact was aggravated or accelerated by his work activity. Id. at 413, 495 P.2d at 1169. Chung, 63 Haw. at 652, 636 P.2d at 727-28. The same principles apply in the case of an injury caused by a disease such as hepatitis C. While it may be true that Flor was first exposed to the hepatitis C virus early in her career as a dental hygienist, the record establishes that her contact withpotentially contaminated blood continued throughout her employment with the Employers. The testimony adduced by the parties focused on the time whenFlor originally contracted the disease. However, nothing in the record suggests that subsequent exposures did not contribute to the ongoing progression of thedisease. Ultimately, the cause of Flor’s hepatitis C and its precise relationship to each of her employers remains unknowable. None of the Employers,however, carried their burden of demonstrating that Flor’s employment with them did not contribute to her disability. D. Apportionment Of Liability Among Employers On remand, the Director will be faced with the task of determining which of the Employers are liable for the payment of Flor’s workers’ compensation benefitsand the allocation of such liability. We note that the Workers’ Compensation Law does not contain any express provisions regarding apportionment of liabilityamong multiple employers. See Kalapodes v. E.E. Black, Ltd., 66 Haw 561, 563 n.1, 669 P.2d 635, 637 n.1 (1983). In Kalapodes, the claimant sustained back injuries while in the employ of several consecutive employers, ultimately resulting in a permanent disability fromwork. He initially filed a workers’ compensation claim against his last employer, but later joined the previous employers. The LIRAB determined thattwenty-five percent of Kalapodes’s disability was due to the injury received while working for one employer, five percent was due to the injury received whileworking for another, and the remaining seventy percent was not work-related, and ordered that the two employers pay him corresponding permanent partialdisability compensation in accordance with HRS � 386-32(a) (1976) [FOOTNOTE 8] and, pursuant to HRS � 386-33 (1976), [FOOTNOTE 9] ordered the special compensation fund topay the remaining seventy percent of his compensation. On appeal, the employers argued that the LIRAB was not authorized to apportion workers’compensation liability among successive employers. We affirmed, holding that the LIRAB did not actually “apportion” liability for Kalapodes’s total disability,but, rather, determined the degree of permanent partial disability that Kalapodes had sustained as a result of each of his work-related injuries as if they wereseparate claims adjudicated in one consolidated hearing. Id. at 563-64, 669 P.2d at 637. In the context of workers’ compensation claims arising out of injury caused by an occupational disease, we have noted in the past that the LIRAB has adoptedthe “last injurious exposure” rule to assign liability as between successive employers of the claimant. Miyake v. Welders, Inc., 71 Haw. 269, 271, 788 P.2d170, 171 (1990). See also Survivors of Kinichi Gushikien, Deceased, v. Central Pacific Boiler and Piping and Hawaiian Ins. and Guaranty Co., Case No. AB82-2 (LIRAB 1984), published in 84-1 Haw. Legal Rep. 84-0691 (1984). The “last injurious exposure rule” imposes “full liability for [workers']compensation benefits on the employer or insurance carrier at the time of the employee’s last exposure to a cause of the disabling disease[.]” Beason v. RedBall Oxygen Co., Inc., 702 So. 2d 26, 28 (La. Ct. App. 1997) (citing Gales v. Gold Bond Bldg. Products, 493 So.2d 611 (La. 1986)). “ Pursuant to the last[injurious] exposure rule, determination of liability is not dependent upon the date of disability. The last [injurious] exposure rule is not a rule of causation.Instead, . . . liability falls on the last employer to expose [c]laimant to the occupational hazard for which claim is made.” Crabill v. Hannicon, 963 S.W.2d 440,444 (Mo. Ct. App. 1998) (citing Johnson v. Denton Const. Co., 911 S.W.2d 286, 288 (Mo. 1995)). The last injurious exposure rule is the majority rule in successive employer or insurer cases, either by judicial adoption or by express statutory provision.Larson [Workmen's Compensation Law], supra � 95.20 [(1984)]. It has been utilized in occupational disease cases including those involving asbestosis,silicosis, pneumoconiosis, tuberculosis, arthritis, dermatitis, occupational loss of hearing, and various other diseases produced by inhalation of chemicals andfumes. Id. at � 95.24. The last injurious exposure [rule] is particularly useful for allocating liability in occupational disease cases, which often involve a numberof employers and insurers. Id. The rule avoids the necessity for identification of all employers and insurers as well as the assessment of the proportion of exposure during each employmentand thereby prevents frequent and protracted delays in payments to claimants. See, Lowery . . . , 475 A.2d [at] 1174 . . . ; Inkley v. Forest Fiber ProductsCompany, . . . 605 P.2d 1175 ([Or.] 1980) and Larson, supra, � 95.24. Most courts have felt constrained to interpret the workers’ compensation laws toadopt such a rule so as to best serve the interests of employees who suffer from occupational disease, rather than to attempt an adjustment of their rights in thelight of equities that may exist between successive employers. See Wilson v. Van Burner County, . . . 278 S.W.2d 685 (Tenn. 1955). Even though the liabilityimposed under this rule can have a harsh result in a particular case, it is believed that there will be a spreading of the risk when the total picture of occupationaldisease litigation is considered on an industry-wide, long term basis. Osteen v. A.C. & S., Inc., . . . 307 N.W.2d 514 ([Neb.] 1981); Cordero v. Triple AMachine Shop, 580 F.2d 1331 (9th Cir. 1978); Travelers Insurance Company v. Cardillo, 225 F.2d 137 (2nd Cir. 1955); Lowery, supra; and Larson, supra,� 95.24. Another possible solution to the successive employer or carrier problem would be to apportion liability among all causative employers and their insurers on thebasis of the employee’s proportionate exposure to causative factors during each employment or coverage. As Professor Larson observes, this “would be theideal theory in a perfect world, i.e., a world in which all previous insurers were within the jurisdiction of the board, and the proportion of disability whichoccurred when each was at risk could be easily measured.” Larson [at] � 95.12 (footnotes omitted). In summing up the problems and complications of theapportionment solution, he states: Obviously, however, this isn’t a perfect world and apportioning liability is complicated by such problems as out-of-state employers, statutes of limitations, andthe difficulty of determining the proportion of liability attributable to each insurer. This latter problem is further complicated by the necessity of determiningwho–the insurers or the employee–is to bear the burden of establishing the basis for apportionment. Nonetheless, apportionment is a frequently used solution. See also, Osteen, . . . 307 N.W.2d [at] 519 . . . ; Tennessee Tufting Company v. Potter, 337 S.W.2d 601, 602 (Tenn. 1960); Employers Mutual LiabilityInsurance Company v. McCormick, . . . 217 N.W. 738, 742 ([Wis.] 1928); and Mathis v. State Accident Insurance Fund, . . . 499 P.2d 1331 ([Or. Ct.App.] 1972). The last injurious exposure rule avoids most of the problems of the apportionment solution and because of this promotes efficient administration, speedypayment of claims, and, in most instances, provides the highest level of benefits for the claimant. Gales, 493 So. 2d at 616-17 (emphases added). The Louisiana Supreme Court’s reasoning is persuasive. We note that, in amending HRS � 386-33 in 1982, [FOOTNOTE 10] our legislature adopted a simplified scheme ofapportionment in special compensation fund proceedings reflecting the goal of reducing litigation and its accompanying costs. [T]he legislature stated: The purpose of this bill is to reduce the cost of administering workers compensation claims in those cases where the employee before his work injury suffersfrom a previous disability. While the bill will reduce administrative and legal costs connected with workers’ compensation claims, it will not reduce benefits paidto injured employees. . . . . Your Committee finds that Section 33 in its existing form contributes to the cost of workers’ compensation by introducing uncertainty as to whom should bearliability for work injuries, by encouraging litigation and by encouraging appeals to the Labor and Industrial Relations Appeals Board. The section in its present form requires the director or the Appeals Board as the case may be to make a hypothetical and inherently difficult decision whenevera work injury combines with a previous disability to result in greater permanent partial or in permanent and total disability. In such cases the director or theboard must quantify that disability which would have resulted from the injury without the previous disability. Often this determination is extremely difficult.Physicians frequently are unable to quantify the impairment before an injury and often disagree among themselves. Thus a good deal of uncertainty is injectedinto workers’ compensation cases making settlements less likely and promoting costly litigation. The existing provisions of Section 33 also contribute to the cost of administering workers’ compensation claims by providing a strong incentive to employers toconduct an exhaustive search of the employee’s entire medical history in the hope of finding a previous disability. If earlier injuries or health problems are turnedup, litigation with the Special Compensation Fund ensues. Bumanglang, 78 Hawaii at 281, 892 P.2d at 474 (quoting Sen. Stand. Comm. Rep. No. 215-82, 1982 Senate Journal, at 1040-41) (ellipsis points inoriginal) (emphasis omitted). The legislature’s preference for low-cost, simplified procedures in adjudicating workers’ compensation claims militates, as ageneral rule, against apportioning liability among responsible employers and/or insurers when employment with multiple successive employers has contributedto the progression of an employee’s occupational disease. The virtue, such as it is, of the last injurious exposure rule lies not in achieving individualized justice, but, rather, in the utility of spreading liability fairly amongemployers by the “law of averages” and in reducing the risk and cost of litigation. Bracke v. Baza’r, 646 P.2d 1330, 1336 (Or. 1981). The rule serves todesignate an identifiable event for the assignment of liability for the sake of reducing uncertainty “in a way which is somewhat arbitrary.” Id. at 1337. However,”[t]here is no reason to apply the rule with any greater arbitrariness than is required to achieve its purposes.” Id. at 1337 n.5. In the absence of difficulty inidentifying a definite and certain moment for liability to attach, the rule has no useful application. Singer Co. v. Smith, 362 So. 2d 590, 593 (Miss. 1978); seealso Port of Portland v. Director, Office of Workers Compensation Programs, 932 F.2d 836, 840-41 (9th Cir. 1990) (holding that under last injuriousexposure rule, followed by federal courts interpreting LHWCA, no liability can be imposed on employer who could not, even theoretically, have contributed tocausation of disability); Parks v. Flint Steel Corp., 755 P.2d 680, 683 (Okla. 1988) (“[t]he rule cannot be used to hold claimant’s subsequent employerresponsible for compensation for claimant’s disability, which, according to the unrefuted medical evidence, was caused by and arose during claimant’s [prioremployment]“). In Bond[ v. Rose Ribbon & Carbon Mfg. Co., 200 A.2d 322 (N.J. 1964)], the [New Jersey Supreme] Court considered the problem of assessing liability foran employee’s occupational disease where the inception of that disease cannot be accurately pin-pointed and the employee worked for successive employersor was covered by successive insurance carriers. In doing so, the Court said: Where, as here, an employee is exposed to work conditions which activate or cause a progressive occupational disease, and the existence of such diseaseremains undisclosed and unknown over a period of time, it is impossible upon ultimate revelation of its existence by medical examination, work incapacity, ormanifest loss of physical function, to pinpoint in retrospect, the triggering date of such activation or inception. It is also impossible to reconstruct the daily rateof progress of the disease from its genesis to discovery through one of the afore-mentioned means, where such employee continues to be exposed to workconditions which aggravate the existing disease in unascertainable stages. It follows that where the employment under such work conditions was under theaegis of successive employers or insurance carriers, from initial infection or activation to discovery or manifestation, it is impossible to accurately determine theinception and the rate of progress of the disease during such respective periods of employment or insurance coverage. Therefore, any apportionment ofcompensation liability between the successive employments or insurance coverages, must of necessity be speculative and arbitrary. To avoid the morass intowhich litigation would be pitched were apportionment required, and to eliminate the recognized unsatisfactory nature of any such attempted ascertainment, weconceive that the most workable rule and the most consistent with the philosophy and public policy of the Worker’s Compensation Act is to hold liable thatemployer or carrier during whose employment or coverage the disease was disclosed as above noted, i.e., by medical examination, work incapacity, ormanifest loss of physical function. Although this test is admittedly arbitrary and may on occasion cause some apparently unfair results, over the years it shouldresult in an equitable balancing of liability. Under the circumstances we conceive it to be the fairest and most workable thesis. [. . . 200 A.2d 322. . . .] The Supreme Court clarified Bond in Giagnacovo v. Beggs Bros., [311 A.2d 745 (N.J. 1973)]. There the Court held that two of the stated criteria formanifestation of an occupational disease under Bond, i.e., medical examination and manifest loss of physical function, “represent in substance two methods ofrevelation of a specific degree of physiological pathology — one which is fixed, arrested and definitely measurable.” Id. at 38, 311 A.2d 745. And see Akef v.BASF Corp., [658 A.2d 1252 (N.J. 1995)] (“[w]hen there is evidence that a condition underlying a disability was obvious, diagnosable and capable ofmeasurement, compensation for the resultant disability should be apportioned to or among those employers . . . to cover the periods of prior employmentsduring which the underlying condition was discoverable and measurable.” . . .). Levas v. Midway Sheet Metal, 721 A.2d 742, 729-30 (N.J. Super. Ct. App. Div. 1998) (holding (1) that final employer was not completely liable for totaldisability caused by pulmonary occupational disease that manifested itself during previous employment as partial disability and (2) that allocation of liabilityamong employers who contributed to condition was required) (some brackets added and some in original). In our view the legislature is in a better position to determine what circumstances require [equitable] apportionment than we are. In the absence of a specificstatute on the subject, however, it would appear to us to be applicable only in those rare cases in which substantial and almost uncontroverted medicaltestimony will permit a precise allocation of responsibility between or among different employers or insurers for the employee’s disability. In any event, in anycase in which the employment immediately preceding the employee’s temporary total disability is conceded to have been a contributing cause of such disability,the employee is entitled to receive full benefits promptly from the insurer then furnishing compensation coverage, whether or not the right to equitableapportionment against a former insurer or employer may exist. Michels v. American Hoist & Derrick, 269 N.W.2d 57, 59 (Minn. 1978). See also Atlas Elec. Indus. v. Workmen’s Compensation Appeal Bd., 457 A.2d158 (Pa. Commw. Ct. 1983) (holding that “where . . . the current state of medical science cannot apportion an insidious disease among its several causativefactors, the more recent employer will be held solely liable for an employee’s total disability ‘because it subjected him to a hazard which contributed to thedisability’”); Pacher v. Fairdale Farms, 699 A.2d 43 (Vt. 1997) (holding that last injurious exposure rule is appropriate “only where separate injuries allcausally contribute to the total disability so that it becomes difficult or impossible to allocate liability among several potentially liable employers” and affirmingapportionment where liability of each employer could be fairly defined without confusion either to employers or to employees). We hold that if an employee’s occupational disease is medically diagnosed and ultimately causes the employee’s work disability, then the employer and/or itsinsurer at the time of such diagnosis are liable for the payment of the employee’s workers’ compensation benefits. [FOOTNOTE 11] We further hold that subsequentemployer and/or its insurer at the time of the employee’s diagnosis, are solely liable only if the contribution of the subsequent employment to the developmentof the disability is established by medical evidence and there is no rational basis for apportionment. Finally, we hold that if the medical evidence establishes arational basis upon which to apportion liability among successor and/or predecessor employers and/or their insurance carriers and the apportionment will servethe interests of fairness to both the employers and the employee entitled promptly to receive the compensation, then the Director is authorized to order such anapportionment. In the present matter, Flor’s hepatitis C was actually and conclusively diagnosed on January 12, 1994. Thus, her employers on that date are liable for thepayment of the benefits relating to the claim that had accrued by the time the condition caused her to cease employment on May 4, 1996. However, the recordreflects uncertainty as to the time and source of Flor’s initial infection and the possible contribution of Flor’s various employers to the disease’s development.Consequently, we do not believe that there is a basis for an apportionment of liability that would be less arbitrary than holding liable the employers at risk at thetime of the diagnosis of Flor’s hepatitis C. The foregoing analysis has been focused on determining the relevant date for purposes of assigning liability to Flor’s employers. We have applied a modifiedversion of the last injurious exposure rule in holding that Flor’s employers and/or their insurers as of January 12, 1994 are liable for the payment of the benefitsto which her claim entitles her. Inasmuch as, on that date, Flor was concurrently employed by three dentists, who were insured by two carriers, the Directorwill be required to determine the liability of each of those employers for her workers’ compensation benefits. The last injurious exposure rule is not helpful in resolving the additional and distinct matter of apportioning the liability of multiple and concurrent (as opposed tosuccessive) employers. Riverboat Hotel Casino v. Harold’s Club, 944 P.2d 819, 823 (Nev. 1997). “[T]he [last injurious exposure] rule makes complete sensein the context of successive employments which contribute to an occupational disease; it makes little sense in the present context, where the worker wasexposed to conditions which contributed to her occupational disease in two separate but simultaneous employments.” Id. (quoting Colwell v. Trotman, 615P.2d 1094, 1096 (Or. Ct. App. 1980) (noting that distinction between “successive” employments and “concurrent” ones can become blurred but reversingagency decision to place full liability for dental hygienist’s elbow condition, which was developed while working for two dentists — one on Tuesdays andanother on Wednesdays, Thursdays, and Fridays — on the Wednesday through Friday employer when the employee’s last day of work was Friday and theagency applied last injurious exposure rule)). The apportionment of liability among concurrent employers involves an exercise in fact-finding. Id. at 824 (citing Larson, � 48.50 (1996)). The NevadaSupreme Court, in Riverboat Hotel Casino, supra, held that, in concurrent employment situations, apportionment on the basis of each employer’s responsibilityfor wages was appropriate and that the employers were responsible for the injured employee’s claim in the same proportion as they contributed to her overallwages. Id. Similar results have been reached by several other courts. In Timmons, supra, the claimant was a dental hygienist, who worked part-time for twodentists from September 1991 until she was diagnosed with hepatitis B in February 1992. It was uncontested that hepatitis B was an occupational disease forhealth care workers, but both employers asserted that Timmons could not meet her burden of proving the particular dental office at which she had contractedthe virus. The medical expert testimony established that Timmons, who tested negative for hepatitis B in January 1991 and did not present any risk factorsother than her employment as a dental hygienist, had acquired the virus while in the employ of one of the dentists for whom she had worked since September1991, but that it was impossible to determine which of the dentists it was or from which precise patient the disease had been contracted. The Timmons courtheld thatwhen an employee contracts an occupational disease while doing similar work for two concurrent employers, one employer can be held liable for theemployee’s workers’ compensation benefits only if it can be shown that the occupational disease was contracted as a result of the employee’s work for thatone specific employer. However, if it cannot be determined whether the employee contracted the occupational disease from a specific employer, then bothconcurrent employers are liable. Any other result would violate the public policy of compensating employees for injuries sustained while working in the courseof his or her employment. Apportionment of liability between two concurrent employers is a factual determination appropriately made by the Board. 652 A.2d at 1983. The Timmons court therefore affirmed the apportionment of liability between the two employers in accordance with their wage liability. Seealso Clemmer v. Clemmer, 648 P.2d 341 (N.M. Ct. App. 1982); Holdern v. Lease Management, Inc., 233 N.W.2d 59 (Mich. Ct. App. 1975) (holding thatjoint employers of worker injured in accident were liable for compensation award in proportion to employee’s earnings); but see Oilfield Safety and MachineSpecialties, Inc. v. Harman Unlimited, Inc., 625 F.2d 1248 (5th Cir. 1980) (dual employers are jointly and severally liable for compensable injuries underLHWCA). We note that the Workers’ Compensation Law provides for apportionment of liability for an injured employee’s benefits between the employer and the specialcompensation fund when the employee is concurrently employed in more than one employment and sustains an injury while working for one of the employers.See HRS � 386-51.1 (Supp. 1999). [FOOTNOTE 12] However, the statute does not address the circumstance of multiple concurrent employers being simultaneously liablefor the employee’s benefits. We hold that in those circumstances, the Director may apportion liability among the liable employers. Furthermore, we agree with the courts that haveapproved the apportionment of liability in proportion to the wages earned by the employee in the employ of each of those employers. Such a rule is consistentwith the general principle that workers’ compensation disability benefits are determined on the basis of the employee’s weekly earnings, see HRS � 386-31,and it is simple to apply, thereby reducing the risk and cost of the litigation respecting the liability of each of the concurrent employers. IV. CONCLUSION Based on the foregoing analysis, we vacate the LIRAB’s orders granting the Employers’ motions for summary judgment and remand to the Director for furtherproceedings consistent with this opinion, including (1) the determination whether and during what periods, if any, Flor was temporarily and/or permanently andpartially and/or totally disabled as a result of her hepatitis C and (2) the apportionment of liability with respect to Flor’s workers’ compensation claim amongthe employers at risk on January 12, 1994, namely, Holguin/Pacific, Dierenfield/Travelers, and Babbitt/Pacific. On the briefs: John P. Powell for the claimant-appellant Kathleen M. Flor Scott R. Devenney for employer/insurance carrier- appellee Carlos R. Holguin and Pacific Insurance Co., Ltd. Roland Q.F. Thom and Rock B. Ley (of Char Hamilton Campbell & Thom), for employer/insurance carrier-appellee William R. Babbitt and Pacific Insurance Co., Ltd. :::FOOTNOTES::: FN1 Flor subsequently withdrew her claim relating to the “April 17, 1996″ work injury against Dierenfield/Travelers. FN2 The “undisputed” facts that Flor cited to the LIRAB and this court were the following: 1. Flor has hepatitis C. 2. Flor cannot identify the date [on which] she contracted the illness, and it is not possible at this date to discover the date and manner of transmission. 3. Her profession and instrument sticks she suffered at work present identifiable risk of infection. 4. The first symptoms began in 1990. 5. No tests were available to identify hepatitis C before 1990, and no reliable tests existed before 1992. 6. The usual course of hepatitis C is asymptomatic for the first 10-20 years, except for an initial acute phase. 7. Given Flor’s current condition, it is probable that she contracted the disease prior to 1990. FN3 R.L.H. � 97-3 (1955) provided in relevant part: If a workman receives personal injury by accident arising out of and in the course of the employment or by disease proximately caused by the employment, orresulting from the nature of the employment, his employer or the insurance carrier shall pay compensation in the amounts and to the person or personshereinafter specified. FN4 HRS � 386-3 (1993) provided in relevant part: If an employee suffers personal injury either by accident arising out of and in the course of the employment or by disease proximately caused by or resultingfrom the nature of the employment, the employee’s employer or the special compensation fund shall pay compensation to the employee or the employee’sdependents as hereinafter provided. (Emphasis added.) In 1998, the statute was amended in respects not material to the present appeal. Inasmuch as Flor suffered her disability in 1996, thepre-amendment version of the statute is controlling. See infra section III.B. HRS � 386-1 (1993 & Supp. 1999) defines “‘[e]mployment’ [to] mean[] any service performed by an individual for another person under any contract of hireor apprenticeship, express or implied, oral or written, whether lawfully or unlawfully entered into.” FN5 The claimants in Timmons and Hansen suffered from hepatitis B, but the analysis set forth in those cases applies equally to hepatitis C. FN6 HRS � 386-82 provides in relevant part: The right to compensation under this chapter shall be barred unless a written claim therefor is made to the directorof labor and industrial relations (1) within two years after the date at which the effects of the injury for which the employee is entitled to compensation havebecome manifest, and (2) within five years after the date of the accident or occurrence which caused the injury. FN7 We defer the discussion of the “identifiable instant in time to . . . fix the employer and insurer liable for compensation” to section III.D, infra. FN8 HRS � 386-32(a) (1976) provided in relevant part: In cases in which the permanent partial disability must be rated as a percentage of total loss or impairment of physical or mental function of the whole man themaximum compensation shall be computed on the basis of the corresponding percentage of the product of 312 times the effective maximum weekly benefitrate prescribed in section 386-31. A substantially identical provision is contained in the current Workers’ Compensation Law. See HRS � 386-32(a) (1993 & Supp. 1999). FN9 HRS � 386-33 (1976) provided in relevant part: If an employee receives an injury which of itself would cause a permanent partial disability but which, combined with a previous disability, results in a greaterpermanent partial disability or in permanent total disability, the employer shall pay compensation only for such disability as would have been caused by theinjury without the previous disability. The employee shall be entitled to full compensation for his actual permanent partial or total disability, and, after receipt ofthe compensation payable by the employer, weekly payments of the balance of the compensation to which the employee is entitled shall be made out of thespecial compensation fund by orders of the director of labor and industrial relations. FN10 Compare HRS � 386-33 (1976), supra note 8, with HRS � 386-33 (1993 & Supp. 1999), which provides in relevant part: (a) Where prior to any injury an employee suffers from a previous permanent partial disability already existing prior to the injury for which compensation isclaimed, and the disability resulting from the injury combines with the previous disability, whether the previous permanent partial disability was incurred duringpast or present periods of employment, to result in a greater permanent partial disability or in permanent total disability or in death then weekly benefits shall bepaid as follows: (1) In cases where the disability resulting from the injury combines with the previous disability to result in greater permanent partial disability the employer shallpay the employee compensation for the employee’s actual permanent partial disability but for not more than one hundred four weeks; the balance if any ofcompensation payable to the employee for the employee’s actual permanent partial disability shall thereafter be paid out of the special compensation fund;provided that in successive injury cases where the claimant’s entire permanent partial disability is due to more than one compensable injury, the amount of theaward for the subsequent injury shall be offset by the amount awarded for the prior compensable injury; (2) In cases where the disability resulting from the injury combines with the previous disability to result in permanent total disability, the employer shall pay theemployee for one hundred four weeks and thereafter compensation for permanent total disability shall be paid out of the special compensation fund; and . . . . (b) Notwithstanding subsection (a), in the case of permanent total disability or death, where the director or the appellate board determines that the previouspermanent partial disability amounted to less than that necessary to support an award of thirty-two weeks of compensation for permanent partial disabilitythere shall be no liability on the special compensation fund, and the employer shall pay the employee or the employee’s dependents full compensation for theemployee’s permanent total disability or death. FN11 We emphasize that, under the last injurious exposure rule, the “determination of liability is not dependent upon the date of disability,” Crabill, 963 S.W.2dat 444. In most cases, the employer on the “date of disability,” as construed supra in section III.B, will be the employer liable pursuant to the last injuriousexposure rule. This is because, in a typical case, the discovery of the condition precluding or limiting employment (“date of disability”) is contemporaneous withthe actual cessation of the employment that contributed to the development of the condition (“last injurious exposure”). However, there may be other scenarios.For instance, when disability manifests itself in an employment that could not have contributed to it, but a prior employment in fact did so, the prior employer isliable under the last injurious exposure rule, but the date of disability is the later date of diminished earning capacity. See Port of Portland, supra; Liberty Mut.Ins. Co., supra. Under the circumstances of the present case, the disabling condition (hepatitis C) was diagnosed with medical certainty more than two yearsbefore Flor’s cessation from work. The date of cessation from work, or the closely related date of communication of the diagnosis, is the “date of disability,”see supra section III.B. Applying the usual “last injurious exposure rule,” liability would have attached to the employers “at risk” on that date. However, for thereasons explained in this opinion, we hold that a modification of the rule is appropriate, so that the employers on the date of the original diagnosis are liable. FN12 HRS � 386-51.5 provides: Limited liability in concurrent employment. Where an employee is concurrently engaged in more than one employment covered by this chapter andsustains a personal injury in one employment under conditions specified in section 386-3, the liability of the employer shall be limited to the benefits as wouldbe payable had the employee no other employment than the one in which the employee was injured. The balance of the employee’s benefits shall be paid fromthe special compensation fund, except that benefits for disability rated as a percentage of total impairment of physical or mental function of the whole personshall be the sole liability of the employer.
Flor v. Holguin IN THE SUPREME COURT OF THE STATE OF HAWAII NO. 22641 KATHLEEN M. FLOR, Claimant-Appellant, v. CARLOS RICHARD HOLGUIN, D.D.S., and PACIFIC INSURANCE COMPANY,Employer/Insurance Carrier-Appellee, and DOUGLAS H. DIERENFIELD, D.D.S., and TRAVELERS INSURANCE COMPANY, Employer/InsuranceCarrier-Appellee, and WILLIAM R. BABBITT, D.D.S., and PACIFIC INSURANCE COMPANY, Employer/Insurance Carrier-Appellee, and CARLOSRICARD HOLGUIN, D.D.S., and ISLAND INSURANCE COMPANY, Employer/Insurance Carrier-Appellee, and WILLIAM R. BABBITT, D.D.S.,and CRAWFORD AND COMPANY, Employer/Insurance Carrier-Appellee (CASE NO. AB 98-0077 (WH)) (9-97-000450; 9-97-00451; 9-97-00452;9-96-01636; & 9-96-01660) APPEAL FROM DECISION AND ORDER OF THE LABOR AND INDUSTRIAL RELATIONS BOARD MAY 30, 2000 MOON, C.J., LEVINSON, NAKAYAMA, RAMIL, JJ., AND CIRCUIT COURT JUDGE BAXA, ASSIGNED BY REASON OF VACANCY
 
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