CDC reports surge in cyclosporiasis cases across 31 states

The Centers for Disease Control and Prevention said Thursday that 843 cases of cyclosporiasis have been reported in 31 states, though the actual number is likely higher because many infections go unreported and there is a reporting lag. Michigan alone logged 1,562 cases, and the nation has recorded 86 hospitalizations but no deaths.

Cyclosporiasis, caused by the parasite Cyclospora, spreads through contaminated food or water, often fresh produce. Past outbreaks have been linked to items such as lettuce, raspberries, basil, cilantro and snow peas. The CDC noted a sharper increase in cases over the past two weeks compared with the same period last year, a pattern typical for the spring and summer months.

State health departments from California to Florida have confirmed cases, with the Midwest and Northeast—particularly Michigan and New York—among the hardest hit. The Ohio Department of Health reported 177 cases, most occurring in June. > "Cyclosporiasis is a serious illness that can cause dehydration and require people to seek emergency medical care, and it should be taken seriously," said Dr. Bruce Vanderhoff, director of the Ohio Department of Health.

The source of the current surge remains unknown. Investigators are interviewing patients to trace dietary exposures, but the parasite’s long incubation period—ranging from two days to two weeks or more—makes recall difficult. The Food and Drug Administration has previously associated U.S. outbreaks with various fresh produce items.

Public health officials advise cooking produce to at least 158°F (71°C) to kill the parasite, thorough washing of fruits and vegetables, and standard hand-washing practices. Those experiencing severe diarrhea or dehydration are urged to seek medical care; treatment typically involves antibiotics.