McDonald’s just got hit with its first lawsuit regarding an E. coli outbreak that resulted in Quarter Pounders being pulled at 20% of all U.S. McDonald’s locations. But one prominent food safety lawyer believes the first lawsuit related to the E.

The first lawsuits related to a deadly outbreak of E. coli in the fast food giant’s hamburgers have been filed in Cook County, Illinois. One suit was filed on Thursday on behalf of Colorado resident Eric Stelly, who was one of dozens of customers across the country who have been exposed to the bacteria.

According to the CDC, the outbreak now includes 13 states, up from the previous amount of 10. As many as 75 people have been sickened, the CDC now says, up from the original reported number of 49.