ROCK ISLAND, Ill. (AP) -- Authorities in northwestern Illinois are trying to figure out why a case of hepatitis A in a McDonald's food handler went unreported for more than three weeks.
An estimated 10,000 people who ate at a McDonald's in Milan are being urged to get preventive treatment for the virus, which can cause fever and abdominal pain.
At least 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, possibly spreading 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.