A massive surge in infections from a diarrhea-causing parasite is sweeping across the United States, prompting federal and state investigations as case counts climb far beyond previous years.
The Centers for Disease Control and Prevention has confirmed 1,645 cases of cyclosporiasis since the start of May, with an additional 5,100 suspected cases currently under investigation. The rapid spread of the microscopic parasite Cyclospora cayetanensis has already affected 34 states.
Officials warn that the actual number of infections is likely significantly higher, as many individuals with milder symptoms do not seek medical care or undergo the specific testing required to identify the parasite.
Health officials are currently managing multiple overlapping investigations, including a heavily concentrated regional outbreak in the Midwest. Data indicates that at least 400 cases spanning Michigan, Ohio, West Virginia, and Kentucky appear to be epidemiologically linked, pointing toward a single contaminated food source.
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Michigan is currently the hardest-hit state, reporting more than 3,300 cases—a massive spike for a state that typically sees only about 50 infections annually. Patient interviews conducted by Michigan health authorities point toward lettuce or salad greens as a primary suspect, though a specific grower, supplier, or brand has not yet been isolated.
In response to the growing health scare, the fast-food chain Taco Bell has proactively altered its menus. While public health agencies have not officially tied the outbreak to the restaurant or any specific supplier, Taco Bell has voluntarily and temporarily pulled select fresh ingredients—including lettuce, cilantro, onions, pico de gallo, and guacamole—at various locations in impacted states.
Other major food providers are closely monitoring the situation as the agricultural supply chain undergoes intense federal scrutiny.
Cyclosporiasis is an intestinal illness contracted by consuming food or water contaminated with feces. It is not typically transmitted directly from person to person.
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The parasite is notoriously difficult to wash off raw produce because of its microscopic size and sticky exterior, meaning standard rinsing is often insufficient to prevent infection. To minimize risk, public health officials are advising consumers to avoid pre-washed bagged salad kits and instead purchase whole heads of lettuce, discarding the outer layers before washing and eating.
