Experts Trace 9 Bagged Lettuce Contamination Points as US Cyclospora Outbreak Wanes
Updated
Updated · The New York Times · Aug 20
Experts Trace 9 Bagged Lettuce Contamination Points as US Cyclospora Outbreak Wanes
3 articles · Updated · The New York Times · Aug 20
Summary
Nine contamination points can expose bagged lettuce to cyclospora, E. coli, listeria and salmonella, from farm irrigation and manure to chopping, mixing, shipping and kitchen prep.
Water is a key weak spot because U.S. produce water must be tested for E. coli but not cyclospora, while heavy rain, wastewater and nearby animal waste can taint supplies.
Processing can amplify a single contaminated head into many bags: cutting creates more surfaces, wash systems can fail when debris builds up, and standard sanitizers such as chlorine do not kill cyclospora.
Refrigeration and final handling still matter after packaging, since warm storage lets microbes thrive and rinsing under running water reduces but does not eliminate pathogens; cyclospora is killed only by heating.
Leafy greens remain one of the most common sources of U.S. food-borne outbreaks, though experts say salad is probably safe again as the largest U.S. cyclospora outbreak wanes.