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, and experts have said not every recent U.S. illness might be caused by a single source.

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, Calif., 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 trace-back investigation.”

Taylor Farms has been tied to foodborne outbreaks in the past. The company said in a statement Friday afternoon that it voluntarily was 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.

The 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 typically is treated with antibiotics.

On Thursday, before 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.

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.

Michigan health officials continue to recommend that consumers purchase whole heads of lettuce instead of pre-washed, bagged lettuce or pre-mixed salad kits.

— The Associated Press