CDC Cyclosporiasis Outbreak Map: Intestinal Parasite Diarrhea Infection Hits 31 States As Cases Surge

The CDC is investigating a surge in cyclosporiasis, an intestinal parasite infection, after confirming cases in 31 states, with more than 4,000 reported nationwide.

Health officials are investigating a growing surge in cyclosporiasis, an intestinal parasite infection, after the US Centers for Disease Control and Prevention (CDC) confirmed cases in 31 states.

According to the CDC, 843 cases had been reported through July 9, while NBC News’ tally based on state health department data found more than 4,000 reported cases nationwide as of July 13. The agency said investigations are underway to determine whether the illnesses share a common source.

Cyclosporiasis outbreak map

Michigan, New York, Ohio, Illinois, and North Carolina are among the states reporting the highest numbers of infections.

Michigan has recorded 2,640 cases since late June, including about 44 hospitalizations, a figure roughly 50 times higher than the state’s usual annual average of 40 to 50 cases. Ohio has reported 364 cases, while New York has recorded approximately 394 cases since May 1. Illinois has reported 141 cases, North Carolina 205, Colorado 90, Indiana 72, and Texas 48, including five hospitalizations.

The CDC also said more than 1,500 additional cases require further analysis to determine whether they were acquired within the United States.

Cyclosporiasis is caused by the Cyclospora cayetanensis parasite, which spreads through food or water contaminated with feces. In the United States, infections are commonly linked to fresh fruits and vegetables.

The parasite infects the small intestine and causes severe gastrointestinal illness. Person-to-person transmission is considered uncommon.

Although the CDC said there is no evidence of a single multistate outbreak, the agency and the FDA are monitoring several clusters while trying to identify the source. No specific food, grower or supplier has been linked to the recent increase.

The most common symptom is sudden, watery diarrhea, which the CDC says is often “explosive.” Other symptoms include stomach cramps, bloating, nausea, vomiting, fatigue and loss of appetite.

Symptoms can begin up to 14 days after consuming contaminated food or water and may last for several weeks, with some people experiencing recurring episodes.

Health officials continue to recommend washing fresh produce thoroughly before eating it but say there is currently no reason to avoid eating fresh fruits and vegetables, as investigations into the source remain ongoing.

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