Federal health officials announced the conclusion of the largest cyclospora foodborne illness outbreak recorded in U.S. history, stating confidence that all recalled iceberg lettuce associated with the specific outbreak has been removed from circulation. The Food and Drug Administration made the declaration on Friday.
The multistate outbreak resulted in nearly 13,000 reported cyclospora cases, representing the majority of an unusually large surge in the parasitic diarrheal illness occurring throughout the year. Since May 1, the government received reports of nearly 20,000 lab-confirmed cases, more than 16 times the number reported during the same period in the previous year. Additionally, more than 6,100 suspected cases have been documented. The previous record year for cyclospora infections in the nation was 2019, when approximately 4,700 illnesses were reported nationwide.
Despite the outbreak’s conclusion, significant questions persist regarding how the contamination occurred. The parasite spreads through human feces, and investigators have not determined the mechanism by which sewage contaminated sufficient quantities of food to affect so many consumers. The outbreak primarily affected 21 states and was traced to iceberg lettuce, with Taylor Farms identified as the likely source. The company recalled thousands of packaged salad products combining iceberg lettuce with other vegetables that were distributed to major U.S. restaurant chains. Michigan experienced the most severe impact, reporting the highest number of cases in the state and accounting for two deaths in the nation.
Cyclosporiasis, the illness caused by the microscopic parasite, commonly produces watery diarrhea and is less prevalent than foodborne illnesses caused by salmonella and E. coli. The FDA concluded its on-site inspections and sample collection activities at iceberg lettuce growers and the processing facility in Mexico, with samples from inspections remaining pending analysis. The outbreak has drawn attention to a broader concern regarding reduced international inspections conducted by U.S. regulators to identify contaminated produce before entry into American markets.
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