Federal health officials are racing to identify the source of a parasitic outbreak affecting more than 400 people across 18 states, with Michigan and New York emerging as hotspots for the intestinal illness known as cyclosporiasis.
The culprit is cyclospora, a parasite spread through contaminated raw produce and water tainted with human feces. Infected individuals experience severe watery diarrhea described by the CDC as frequent and sometimes explosive, along with cramps, nausea, fatigue, loss of appetite, low-grade fever, and vomiting.
Between May 1 and June 16, the CDC documented 145 cases across 17 states, with 20 requiring hospitalization. New York, Texas, Illinois, and Michigan have been hit hardest, though cases also appeared in Alaska, Colorado, Connecticut, Florida, Georgia, Louisiana, Massachusetts, New Jersey, North Carolina, Ohio, Pennsylvania, Tennessee, Virginia, and Wisconsin.
Michigan's outbreak has proven particularly alarming. Since June 22, the state reported more than 300 cases, far exceeding its typical annual count of roughly 50. New York has logged 107 cases since May 1, and health officials in New York City noted case counts roughly doubled from January through June compared to the previous year.
The CDC and FDA are working with state and local authorities to investigate potential clusters. So far, investigators have found no evidence of a single multi-state outbreak linking all cases. Instead, they believe multiple sources may be responsible for illness across different regions, with sick individuals reporting no international travel in the two weeks before becoming ill.
Cyclosporiasis is seasonal in the United States, typically peaking between May and August when consumption of fresh produce increases. Past outbreaks have been linked to basil, cilantro, spinach, and berries. The current surge coincides with this high-risk season, making the unidentified sources particularly concerning to health authorities.
Symptoms can appear anywhere from two days to two weeks after infection, and some people never develop symptoms at all. While the infection is not typically life-threatening and no deaths have been reported, severe cases require antibiotic treatment. Most people with healthy immune systems recover on their own within days or weeks.
The CDC recommends thoroughly washing all fresh produce before eating, along with hands and kitchen surfaces. Those experiencing symptoms should contact their healthcare provider and report positive tests to local health departments. Staying hydrated is critical to prevent dehydration from diarrhea.
Author James Rodriguez: "The speed and scale of this outbreak should worry anyone buying produce at the grocery store, but the real mystery is why investigators still can't pinpoint a common source."
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