Illinois health officials are trying to find the source of a Mexican-style cheese that has resulted in about 100 cases of salmonella in the state. Dr. LaMar Hasbrouck, with the Illinois Department of Public Health, says the cheese comes wrapped in aluminum foil, and is sold at work sites, train stations, and street vendors, not through a retail outlet. He says it's not a particular brand. It doesn't have a label on it, it doesn't have a manufacture information on it. And that's the problem. The Department says about a third of cases have resulted with people in hospitals.