Health investigators have identified Taylor Farms, a supplier of shredded iceberg lettuce used by Taco Bell, as a possible source of an outbreak of cyclosporiasis, an intestinal illness caused by a parasite that causes severe diarrhoea. The development matters because it points to a potential link between a widely used fast-food ingredient and a spreading gastrointestinal illness, raising questions about food safety controls in the supply chain.

Cyclosporiasis is caused by the parasite Cyclospora cayetanensis and is typically contracted through contaminated food or water, with symptoms including watery diarrhoea, cramping, bloating, fatigue and weight loss. The original article text did not provide further specifics, such as confirmed case numbers, the states or regions affected, or whether Taco Bell or Taylor Farms have issued a formal response, so these details remain unclear from the available source material.