Over 3,000 Cyclospora cases in Michigan, Ohio; lettuce investigated

Over 3,000 Cyclospora cases reported in Michigan and Ohio, with 46 hospitalizations.

Michigan officials said lettuce is a common product among infected individuals, but no specific source has been identified.

Michigan reported 2,640 cases and 44 hospitalizations; Ohio reported 361 cases since June 1.

CDC reported 843 confirmed cases nationally since May 1, with increases in multiple states.

Tracing Cyclospora is harder than E. coli or salmonella because genetic testing is less effective for this parasite.