ATLANTA — Federal health officials have identified lettuce from Mexico served at Taco Bell locations across five U.S. states as a source of a widespread outbreak of diarrhea-causing parasite cyclospora.

The Centers for Disease Control and Prevention late Thursday warned consumers not to eat shredded iceberg lettuce from Taco Bell restaurants in Indiana, Kentucky, Michigan, Ohio and West Virginia. A record number of cyclospora cases have been reported in more than 30 states.

A Food and Drug Administration investigation so far has identified a single supplier of the lettuce. The federal warnings to consumers did not identify the company, but Taylor Fresh Foods, of Salinas, California, said FDA testing indicated it was “a specific independent farm” affiliated with the company.

The FDA was working with the supplier “to determine if potentially contaminated shredded iceberg lettuce remains on the market,” including in other states, the CDC said. “Taco Bell has committed to stop using any lettuce from the supplier identified by FDA’s traceback investigation.”

Taylor Farms has been tied to food-borne outbreaks in the past. The company said in a statement Friday afternoon that it was voluntarily removing all iceberg lettuce sourced from central Mexico from the U.S. market.

“As a family owned and operated company, we are deeply concerned for those who became ill, their families, and the many Americans whose trust in the safety of their fresh produce has been shaken,” the statement said.

Others may be linked

CDC, FDA and public health officials in several states have been investigating a multistate outbreak of cyclospora infections.

The illness is not usually life threatening and is typically treated with antibiotics.

On Thursday, ahead of the federal government’s confirmation, Taco Bell issued a statement saying that it had taken “immediate action to voluntarily remove potentially impacted lettuce from a supplier in select states. The affected ingredient from our supplier is being indefinitely removed from our supply chain nationwide and will be replaced within 24 hours in select states.”

In a statement, federal health officials stressed that other “brands, restaurants, retailers, or distribution channels” could be tied to the outbreak as the investigation continues.