A Missouri couple has sued ConAgra Foods Inc. over a salmonella outbreak linked to its peanut butter, and their attorney said more suits will follow.

The lawsuit was filed in U.S. District Court in Kansas City by Susanna and Brian Cox of St. Joseph. It claims that Susanna Cox and the couple’s two children began developing gastrointestinal illnesses in October after eating Great Value Peanut Butter, made by ConAgra. The two children required urgent medical treatment, according to the lawsuit.