US Cyclospora outbreak traced to Mexican lettuce; Mexico reports three isolated cases

The United States has recorded more than 4,000 laboratory‑confirmed cases of cyclosporiasis since May, with infections reported in 41 states, 308 hospitalisations and no deaths. Health officials link the multi‑state outbreak to shredded iceberg lettuce supplied by Taylor Farms de México. The FDA initially identified a positive test for Cyclospora in a lettuce sample, then retracted the result, calling it a false positive, while the agency continues its investigation and has overseen a voluntary recall of the product.

Mexico’s health secretary, David Kershenobich, said that only three cyclosporiasis cases have been confirmed domestically and that these fit the country’s usual epidemiological pattern, so no outbreak exists. He noted that the FDA’s earlier positive test was later deemed erroneous, and that Mexican authorities have taken independent samples at the Guanajuato processing plant but have found no evidence of contamination. Active surveillance and coordination with U.S. agencies remain in place.

Separately, Oklahoma alone reported 172 cases, underscoring the widespread nature of the outbreak across the United States.