A widespread outbreak of cyclosporiasis, an infection caused by the Cyclospora cayetanensis parasite, has affected hundreds across multiple states. The Centers for Disease Control and Prevention (CDC) have reported 145 confirmed cases between May 1 and June 16, leading to 20 hospitalizations. However, local observations suggest a much higher count, with at least 18 states reporting occurrences.
Michigan at the Epicenter
Michigan has reported a significant spike in cases, with more than 300 identified incidents. This figure starkly contrasts with the state’s usual annual count of about 50 cases. Most infections are in Southeast and Southern Michigan, particularly Monroe County. Other affected areas include Lenawee, Washtenaw, Wayne, Livingston, Shiawassee, Jackson counties, and Detroit city.
Dr. Natasha Bagdasarian, Michigan’s chief medical executive, anticipates further cases. The rise in cyclosporiasis had led to a state-wide health response aimed at curbing further spread.
New York and Other Affected States
New York has tracked 107 cases since early May. Authorities across various states, including Illinois, Texas, and many more, have identified similar outbreaks. The cases, noted before June 16, show no travel history, indicating local transmission.
Understanding Cyclosporiasis
Cyclosporiasis results from ingesting Cyclospora cayetanensis in contaminated food or water. Symptoms like nausea, cramps, fatigue, and diarrhea may manifest up to two weeks post-exposure. Though generally self-limiting, vulnerable populations risk severe complications.
To treat cyclosporiasis, a regime using antibiotics such as trimethoprim-sulfamethoxazole (Bactrim, Septra, Cotrim) is recommended. Hydration and rest are crucial in addressing the dehydration risk from diarrhea.
States Respond
Federal health officials have not identified a single source for these outbreaks. Instead, multiple localized clusters are suspected. Past incidences were tied to imported produce like raspberries, basil, and cilantro. The CDC collaborates with the FDA and local agencies to track the outbreak’s origin.
Jennifer Bonsky from the Michigan Department of Agriculture and Rural Development emphasizes food safety practices, such as handwashing and thorough washing of produce, to mitigate risks.

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