As many as 5,000 people might have been exposed to Hepatitis A at a Red Robin restaurant in Springfield.
With the latest MERS case involving an Illinois man, the city health director says she wants to make sure if a case pops up here health officials can respond quickly to contain it.
The CDC and WHO claim they are hard at work tracking 100 people that may have come in contact with the deadly MERS virus.
More than 350 million people are chronically infected with the virus that causes severe liver damage and many kinds of health problems including liver cancer and death.
Dr. Adrian Bisceglie says practical applications could include identifying emerging viruses or combating terrorism.
The human cases have been reported in Chicago, Evanston and several Chicago suburbs.
Tainted bugs have turned up in No. County, Normandy, Olivette, Jennings, elsewhere.
The county health department says the 12 year-old boy was hospitalized briefly.
Mosquitoes with West Nile have been found in communities ranging from Lemay in the southern part of the county to Florissant.
As weather warms, such sites provide perfect breeding ground for mosquitoes, West Nile virus.