An outbreak of infections caused by the Cyclospora parasite affected 145 people. The source of the parasite is not yet known.
Cases were reported in 17 states. These people became ill after eating food in the United States and did not report any travel in the 14 days prior to becoming ill.
The ages of the sick people ranged from 5 to 86 years, with a median age of 42 years. The median disease onset was May 13 and ranged from May 1 to June 6. Of the 145 people for whom information was available, 20 were hospitalized. No deaths were reported.
Local, state and federal public health officials are investigating multiple clusters of cases in multiple states. An investigation is ongoing to determine potential sources.
The map shows where 145 people with cyclosporiasis have lived in the United States since May 1, 2026. Cyclosporiasis cases may not be limited to these states with known cases.
The actual number of people with cyclosporiasis is likely higher than reported. This is because some people recover without medical treatment and are not tested for Cyclospora.
Cyclospora is a nationally reportable disease and is reportable in 47 states, the District of Columbia, and New York City. Even if the state is unable to report, it is important for health care providers and the public to notify local health departments about potential disease cases and clusters so that appropriate action can be taken to prevent additional cases.
Introduction to Cyclospora
Anyone who develops symptoms of Cyclospora infection and has reason to believe they have been exposed to the parasite should seek medical attention. Specific tests are required and antibiotics are used to fight parasites.
Cyclospora infection can cause severe abdominal pain, watery diarrhea, nausea, vomiting, body aches, and fatigue. Symptoms may appear between 2 and 14 days after exposure. Although symptoms can be severe enough to send people to the hospital, death from Cyclospora infection is rare.
Cyclospora is a type of protozoa, small single-celled organisms. It is spread when people ingest contaminated feces, usually through contaminated food or water. Unlike E. coli or Salmonella, which can also be transmitted in animal feces, it can only be transmitted through human feces.
Previous outbreaks of cyclosporiasis in the United States have been linked to a variety of fresh produce, including basil, cilantro, mesclun lettuce, raspberries, and peas.
Food safety experts say there is no evidence that washing produce eliminates parasites.
