The F.D.A. is expanding its investigation into the Cyclospora outbreak, now focusing on farms and a lettuce shredding facility in Mexico. The goal is to pinpoint the source of contamination in lettuce supplied by Taylor Farms to Taco Bell.

Investigators aim to understand how the produce became contaminated and where the affected lettuce was distributed. This move signals a deepening probe into the supply chain, with a particular emphasis on agricultural practices and processing methods in Mexico.

The outbreak has led to widespread concern and prompted a thorough examination of food safety protocols. The F.D.A.'s inspection of these Mexican facilities is a critical step in identifying the origin of the contamination and preventing future occurrences. Taylor Farms is cooperating with the investigation.