Cyclospora parasite linked to dozens of diarrheal illnesses across multiple states

The U.S. Centers for Disease Control and Prevention said 145 cases of cyclosporiasis were reported in 17 states between May 1 and June 16, and at least 20 patients were hospitalized. Summer typically brings higher case numbers, but Michigan has recorded an unusually high surge, reporting at least 170 cases in seven counties over nine days, a figure not yet reflected in the CDC tally. New York State, excluding New York City, logged 107 cases during the same period, far below its usual annual total of 500-700.

Federal and state health officials noted that no single multistate outbreak has been identified, and investigations are ongoing to pinpoint possible clusters and sources. Cyclosporiasis is caused by the Cyclospora parasite, a single-cell organism transmitted through contaminated water used on crops. Dr. David Freeman, professor emeritus of infectious diseases at the University of Alabama at Birmingham, explained that the parasite multiplies in humid field conditions and is often associated with herbs such as cilantro and basil, as well as fresh berries.

"Just the act of washing it with a lot of water is certainly going to get the organisms off of there," Freeman said, emphasizing thorough rinsing of produce. He added that bleach does not kill the parasite, so standard cleaning wipes are ineffective; handwashing with soap and water followed by alcohol-based sanitizer is recommended.

Symptoms typically include frequent watery diarrhea, loss of appetite, and low-grade fever, appearing 2 to 14 days after consumption of contaminated food. Freeman advised staying hydrated with electrolyte solutions and seeking medical care for severe diarrhea or fever.