The US Centers for Disease Control and Prevention (CDC) is investigating an outbreak of a parasite that causes explosive diarrhea, with over 100 cases reported across several states. The agency suspects the outbreak may be linked to imported produce, though no specific source has been confirmed yet.
Outbreak Details
As of July 3, 2026, the CDC has identified 112 cases of cyclosporiasis, an intestinal illness caused by the parasite Cyclospora cayetanensis. Symptoms include watery diarrhea, often explosive, along with loss of appetite, weight loss, stomach cramps, bloating, nausea, and fatigue. The cases span 12 states, with the highest numbers in Texas, Illinois, and New York.
According to the CDC, the outbreak appears to be ongoing, with cases reported from May to June 2026. No deaths have been reported, but 12 people have been hospitalized. The agency is working with state and local health departments to interview patients and trace food exposures.
Suspected Source
Preliminary investigations suggest that imported fresh produce, such as cilantro, basil, or raspberries, may be the culprit. Cyclospora outbreaks in the US have historically been linked to imported fruits and vegetables. The CDC advises consumers to wash all produce thoroughly, though this may not eliminate the parasite entirely.
“We are urging healthcare providers to test patients with prolonged diarrhea for Cyclospora,” said Dr. Sarah Johnson, a CDC epidemiologist. “Early diagnosis and treatment with antibiotics can shorten the illness and prevent complications.”
Public Health Response
The CDC has issued a health advisory to clinicians and public health departments, recommending increased testing and reporting. The agency is also collaborating with the Food and Drug Administration (FDA) to trace the source of the contaminated produce. Import alerts may be issued if a specific country or grower is identified.
Cyclosporiasis is not contagious from person to person, but it can cause severe and prolonged illness in immunocompromised individuals. The incubation period averages about one week, and symptoms can last from a few days to over a month if untreated.
Prevention Tips
To reduce the risk of infection, the CDC recommends thoroughly washing fresh fruits and vegetables under running water, and cooking produce when possible. Travelers to tropical regions should also avoid raw produce and untreated water.
The investigation is ongoing, and updates will be provided as more information becomes available. The CDC encourages anyone with symptoms to seek medical attention and report their illness to local health authorities.
