A Pennsylvania federal judge has allowed the majority of claims to proceed against Merck & Co. in a qui tam suit and related antitrust putative class action over the company’s testing and government sales of its mumps vaccine.

U.S. District Judge C. Darnell Jones II of the Eastern District of Pennsylvania issued one opinion Friday in two related suits—United States v. Merck & Co. and Chatom Primary Care v. Merck & Co.