Cyclosporiasis Outbreak Hits 2,640 Cases in Michigan; Lettuce Identified as Likely Source

Michigan’s Department of Health and Human Services reported 2,640 cyclosporiasis cases as of July 13, a 69% jump from 1,562 cases just three days earlier. The parasitic infection, which causes severe watery diarrhea and stomach cramps, has been linked to contaminated lettuce or salad greens based on early investigation findings. The outbreak is unprecedented for Michigan, which typically sees only 40-50 cases annually. The CDC has confirmed 843 cases across 31 states, with 86 people hospitalized and no deaths reported.

How the outbreak unfolded across Michigan and beyond

Michigan first reported the outbreak on July 1 after detecting over 170 cases in seven counties. The state’s case count has accelerated dramatically. As of July 9, the CDC had reported 843 confirmed cases and 1,500 suspected cases across 31 states, but Michigan alone accounts for more than half of all U.S. cases. West Virginia declared a statewide outbreak after confirming 69 cases and eight hospitalizations. Ohio reported 177 cases. Illinois reported nearly 200 cases, including 47 probable cases in Chicago.

Lettuce emerges as the leading suspect

Michigan health officials identified lettuce and salad greens as a potential source after completing over 1,000 interviews with infected individuals. Dr. Natasha Bagdasarian, the state’s chief medical executive, stated that “early information has shown lettuce as a common product that regularly comes up during the investigation.” However, officials cautioned that no specific type of produce, grower, or supplier has been identified. Other food items cannot be ruled out. Past outbreaks have been linked to bagged salad mixes, fresh cilantro, raspberries, and snow peas.

Why the investigation is taking time

Cyclosporiasis symptoms can take up to two weeks to develop after exposure, complicating traceback efforts. Food distribution networks are complex, making it difficult to pinpoint a single source. The CDC expects the federal case count to rise due to typical delays in disease investigation and reporting. Barbara Kowalcyk, an associate professor at George Washington University’s Milken Institute of Public Health, compared the investigation to assembling a puzzle with missing pieces, noting that recent federal funding cuts to state and local health departments have made coordination harder.

What people should know about cyclosporiasis

Cyclosporiasis is caused by a microscopic parasite, Cyclospora cayetanensis, that infects the intestines. Symptoms include watery diarrhea, nausea, stomach cramps, loss of appetite, and fatigue that can last weeks without treatment. The parasite spreads through food or water contaminated with feces from infected people. Symptoms typically appear within two to 14 days of exposure. The CDC notes that routine chemical disinfection is unlikely to kill the parasite, but washing produce thoroughly under running water and cooking leafy greens can reduce risk. Whole heads of lettuce are safer than pre-washed varieties.

Final Thoughts

With Michigan reporting 2,640 cases and lettuce identified as a likely culprit, consumers should wash produce thoroughly and consider cooking leafy greens until the outbreak source is confirmed. The investigation is ongoing, and case counts are expected to rise as reporting lags catch up.

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