U.S. health officials are tracking an outbreak of cyclosporiasis, a diarrheal illness caused by the parasite Cyclospora cayetanensis, across at least 10 states [3].
The surge in infections poses a significant public health risk because the parasite is typically transmitted through common food sources, making it difficult to isolate the exact point of contamination for all patients.
Confirmed cases have appeared in several regions, including California and Massachusetts [2, 3]. Reports on the total number of infections vary among sources, with figures ranging from more than 1,000 [1] to about 1,200 cases [2]. The outbreak began in June and intensified through early July.
Transmission occurs when people ingest food or water contaminated with Cyclospora oocysts [4, 5]. Health officials said raw fresh produce is the most frequent vehicle for the parasite [4]. In Massachusetts, the Department of Public Health said it identified several cases linked to a local restaurant and is working with the establishment to ensure proper sanitation [6].
Symptoms of the infection typically appear between two and 14 days after exposure [4]. Dr. Emily Hart, an infectious disease specialist, said the symptoms include explosive diarrhea, fever, and abdominal cramps [2].
The Centers for Disease Control and Prevention (CDC) and state health departments are coordinating the response. A CDC spokesperson said the agency is monitoring the situation and urges the public to practice safe food handling and thorough cooking of fresh produce [1].
“Cyclospora spreads through contaminated fresh produce, and symptoms include explosive diarrhea, fever, and abdominal cramps.”
This outbreak highlights the vulnerability of the U.S. food supply chain to parasitic contamination, particularly regarding fresh produce that is often consumed raw. Because the incubation period can last up to two weeks, identifying the specific contaminated product requires extensive traceback investigations by the CDC and state agencies to prevent further spread.
