Cyclospora

At least 285 people in 11 states have been sickened by a parasitic infection commonly linked to fresh produce, and the exact cause of the outbreak has yet to be pinpointed, the U.S. Centers for Disease Control and Prevention said on Thursday.

Most of the cyclospora infections have been clustered in the Midwest, with 138 cases reported in Iowa and 70 in neighboring Nebraska. The remainder have been identified in Texas, Georgia, Wisconsin, Connecticut, Illinois, Kansas, Minnesota, New Jersey and Ohio.

The cause of the illness has not yet been identified, but the parasite is most commonly found in fresh produce, including fruits, vegetables and herbs, grown in tropical and subtropical regions, according to Dr. Barbara Herwaldt, a medical epidemiologist at the CDC.