A surge of cyclosporiasis across the United States has created an unusual health crisis, with Michigan now facing its largest outbreak on record. The state has documented close to 1,000 cases of the parasitic illness, far exceeding its typical annual count of about 50 cases and marking one of the nation's worst outbreaks in recent years.
The CDC has confirmed 145 cases spanning 17 states as of mid-June, though state-level reporting suggests the actual number is significantly higher. Ohio reported 177 cases alone. No deaths have been linked to the outbreak, and the illness is rarely life-threatening, according to health officials.
Late Thursday, federal investigators traced the source to lettuce from Mexico served at Taco Bell locations across five states. The FDA identified a single supplier and warned consumers to avoid shredded iceberg lettuce from Taco Bell restaurants in Indiana, Kentucky, Michigan, Ohio, and West Virginia. The chain has pledged to halt use of lettuce from the identified supplier.
Cyclosporiasis stems from the parasite cyclospora, which contaminates raw produce and water through human waste. The illness strikes seasonally in the US, with peak transmission occurring between May and August. Past outbreaks have traced back to contaminated berries, spinach, basil, cilantro, and other raw vegetables.
Symptoms strike an average of one week after consuming contaminated food, though onset can occur between two days and two weeks. The hallmark is intense watery diarrhea marked by frequent, sometimes explosive bowel movements that may temporarily resolve then return. Sufferers often endure cramping, nausea, fatigue, appetite loss, low-grade fever, and vomiting. The illness can persist for days or stretch beyond a month.
Most people recover without treatment, though antibiotics are standard care. Those with compromised immune systems face greater risk. Person-to-person transmission is uncommon.
The Michigan outbreak ranks among a small group of US cyclosporiasis incidents exceeding 1,000 cases in two decades. A 1996 outbreak tied to Guatemalan raspberries sickened nearly 1,500 people, while a 2019 outbreak linked to Mexican basil infected more than 2,400 across the US and Canada. In 2022, contaminated lettuce in packaged salad kits caused a Florida surge affecting hundreds.
Prevention requires vigilance. Whole heads of lettuce offer safer alternatives to pre-washed bags and salad mixes. Health officials recommend removing the outer two to three leaves before rinsing the remainder under running water. Thorough washing helps reduce risk, though cyclospora clings stubbornly to foods with crevices like raspberries, blackberries, and leafy greens. Cooking produce kills the parasite entirely, making heat treatment the most reliable safeguard.
Author James Rodriguez: "This outbreak exposes how vulnerable our food supply remains to contamination at the source, and no amount of washing at home can fully compensate for a compromised supplier."
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