Test that found source of US explosive diarrhoea outbreak was false positive

An outbreak of cyclosporiasis, a foodborne illness causing severe diarrhea, has affected thousands in the U.S., with at least 94 hospitalizations but no deaths reported. Initially, the FDA identified iceberg lettuce from Taylor Farms, a supplier for Taco Bell, as the source after a sample tested positive for the parasite Cyclospora. However, further analysis revealed this result was a false positive. Despite this, Taylor Farms has voluntarily removed all iceberg lettuce sourced from central Mexico from the U.S. market. The CDC advises against consuming shredded iceberg lettuce from Taco Bell in five states, and the fast-food chain has already removed the affected lettuce. The outbreak, first detected in May, has led to recalls in 27 states, including products sold at Walmart. The FDA continues to investigate the outbreak’s source, emphasizing the complexity of detecting Cyclospora. QUESTION: How might the uncertainty in identifying the exact source of the outbreak impact public trust in food safety regulations?