Test that found source of US explosive diarrhoea outbreak was false positive, health officials say
It said on Sunday that it had re-reviewed the sample and reported the false-positive to Taylor Farms, adding it "continues working with the firm to ensure product implicated in this outbreak has been removed from the market". The latest update means the exact source of the parasite is still not known. No deaths have been reported from cyclosporiasis infections, but at least 94 people have been hospitalised.
- ▪It said on Sunday that it had re-reviewed the sample and reported the false-positive to Taylor Farms, adding it "continues working with the firm to ensure product implicated in this outbreak has been removed from the market".
- ▪The latest update means the exact source of the parasite is still not known.
- ▪No deaths have been reported from cyclosporiasis infections, but at least 94 people have been hospitalised.
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Test that found source of US explosive diarrhoea outbreak was false positive, health officials sayImage source, Getty ImagesByKathryn ArmstrongPublished19 July 2026Updated 48 minutes agoTests of an iceberg lettuce sample for the parasite that has caused an explosive diarrhoea outbreak affecting thousands of people in the US produced a false positive, officials have now said.The Food and Drug Administration (FDA) on Saturday reported that the sample from food supplier Taylor Farms, which supplies the Taco Bell food chain, had tested positive for cyclospora. It said on Sunday that it had re-reviewed the sample and reported the false-positive to Taylor Farms, adding it "continues working with the firm to ensure product implicated in this outbreak has been removed from the market".
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