The multistate cyclosporiasis outbreak traced to Taylor Farms shredded iceberg lettuce has expanded to nine states, federal health officials said on Friday. The outbreak, which has sickened thousands, now includes Illinois, Kansas, Oklahoma and Pennsylvania, according to the CDC and FDA. Initially, health officials said the outbreak was contained to Indiana, Kentucky, Michigan, Ohio and West

Some US states are facing a large and growing outbreak of diarrhea caused by cyclospora, a microscopic parasite that can contaminate fresh food or water.

CDC confirms 4,173 U.S. Cyclospora cases as it investigates a lettuce-linked outbreak. More than 7,400 additional reports remain under review.

Investigators believe additional states will help them better construct how cyclosporiasis moved through the nation's food supply.