Federal health officials have linked four more states to an outbreak of a diarrhea-causing parasite.

U.S. health officials are investigating a new outbreak involving the diarrhea-causing parasite cyclospora.

Federal health officials have remained focused on lettuce from Taylor Farms as the source of a multistate outbreak despite inaccurate test results reported over the weekend.

Taylor Farms has expanded a voluntary recall of its iceberg lettuce products sourced from central Mexico because of a potential link to the multistate cyclospora outbreak that has sickened people across the U.S. The California-based company said products with the potential to be contaminated with the diarrhea-causing parasite were shipped to 27 states including Texas, Florida, Pennsylvania and Illinois.

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

Infections from the diarrhea-causing parasite cyclospora are surging, with 2026 already the nation's worst year for reported cases.

Michigan is experiencing its largest outbreak of a parasitic infection that causes severe diarrhea.

A microscopic parasite making waves across the country has now been identified in Florida, according to the CDC.