A parasitic stomach illness has infected more than 4,100 people across the United States, with the Centers for Disease Control and Prevention (CDC) reporting 308 confirmed cyclosporiasis cases hospitalized in 41 states and no deaths so far.

Symptoms appear about a week after exposure to Cyclospora cayetanensis through contaminated food or water, causing frequent diarrhoea that can persist for weeks. The CDC warned that 7,400 people with suspected infection were under review and the total could rise.

On July 17, US firm Taylor Farms issued a recall for iceberg lettuce grown in Mexico and exported to US shops and restaurants, after investigators pointed to Mexican facilities as a likely source. Mexican Secretary of Health David Kershenobich denied the findings, saying there was no evidence the outbreak began in Guanajuato.

The FDA has issued conflicting statements: a Mexican lettuce sample from Taylor Farms initially tested positive for the parasite, but a re‑review declared the result a false positive. The agency later reiterated that its supply‑chain investigation continues to point to the company’s Mexican facilities as the source.