You want Hep A with that? About 10,000 people who ate at a McDonald’s in Milan, Illinois are being urged to get preventive treatment for the Hepatitis A virus. About 20 cases of hepatitis A have been confirmed in five Illinois counties, said Rock Island County Health Department spokeswoman Theresa Foes.

An infected McDonald’s employee came to work on seven days in July, which may have spread the virus to patrons. Another McDonald’s worker was diagnosed June 17, but health officials didn’t know about that case until July 13, said Illinois Department of Public Health spokeswoman Melaney Arnold.

This isn’t good news for McDonald’s – who are already trying to prove that they aren’t one of the reasons the American population is becoming more unhealthy each year.