A parasitic infection, cyclospora, has affected nearly 7,000 individuals across 34 states since May 1, with symptoms including frequent, watery diarrhea. Michigan has been particularly hard hit, reporting over 3,300 cases, followed by New York. The Centers for Disease Control and Prevention (CDC) has cautioned that an additional 7,400 suspected cases are currently under review, indicating a potential increase in the total count of infections.
Several factors have complicated the identification of the outbreak's source. The parasite is notoriously difficult to trace, partly due to the one to two-week incubation period before symptoms appear, which makes retrospective food consumption tracking challenging. Additionally, testing food for cyclospora is significantly more complex than for other pathogens. Some experts also attribute these difficulties to cuts in federal health agencies and programs, including the Foodborne Diseases Active Surveillance Network (FoodNet), which scaled back monitoring for most pathogens last year due to underfunding.
Despite the challenges, investigations are ongoing. US firm Taylor Farms issued a recall on July 17 for iceberg lettuce grown in Mexico and exported to the US, after investigators pointed to their Mexican facilities as a likely source. Michigan health officials have reported strong evidence linking the outbreak to shredded iceberg lettuce supplied by Taylor Farms, particularly that served at some Taco Bell locations. However, the US Food and Drug Administration (FDA) has provided conflicting information, including a false positive test result for the parasite in a Mexican lettuce sample from Taylor Farms, and the Mexican Secretary of Health has disputed claims that the outbreak originated in Guanajuato.
As of recent reports, the CDC has identified five states with cases strongly linked to the outbreak: Indiana, Kentucky, Michigan, Ohio, and West Virginia. Health Secretary Robert F. Kennedy Jr. stated on July 21 that the multistate cyclospora outbreak is "under control," following extensive epidemiological investigations by the Department of Health and Human Services. However, state health departments are reporting significantly higher numbers than the CDC's official count, which remains at 1,644 confirmed cases from May 13 to July 13, with an additional 5,100 under investigation.
Consumers have been advised to thoroughly wash produce, avoid certain fruits like raspberries, and cook vegetables to eliminate the pathogen. Taco Bell has stopped using lettuce from Taylor Farms, and the company's recalled products, including shredded iceberg lettuce and salad kits, were supplied to major retailers like Walmart, Costco, Target, Whole Foods, and McDonald's, as well as to foodservice suppliers like Sysco.
