FDA Confirms Cyclospora Parasite at Mexican Farm Behind Major U.S. Lettuce Contamination

The FDA detected cyclospora parasites in wastewater and drainage systems at a Mexican lettuce farm operated by Taylor Farms, confirming the source of the largest cyclospora outbreak in U.S. history that sickened nearly 13,000 people. Although investigators identified the contamination site, the precise mechanism of how the parasite reached the lettuce remains unclear. The farm has implemented enhanced safety protocols and remains closed as the investigation concludes.

The FDA's detection of cyclospora parasites in wastewater and drainage infrastructure at the Taylor Farms facility in Guanajuato represents a significant milestone in resolving a major public health incident. Nearly 13,000 individuals across the United States contracted cyclosporiasis, a parasitic infection transmitted through human waste contamination. The investigation required the FDA to dispatch inspectors to Mexico for the first time in over seven years, highlighting how pandemic-related reductions in international food safety monitoring may have created inspection gaps.

Despite confirming the outbreak's origin site, investigators have not yet established the exact pathway by which cyclospora reached the lettuce crops. The discovery follows a previous setback when the FDA retracted an erroneous test result, and notably contrasts with Mexican authorities' separate investigation, which failed to detect parasites in samples from the same facility. Taylor Farms has attributed contamination to a third-party grower and implemented enhanced protocols while awaiting full investigation closure.