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(CNN) – Shredded iceberg lettuce sold at some Taco Bell restaurants was linked to a multistate outbreak of explosive diarrhea caused by a parasite, according to a source familiar with the investigation.
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The lettuce was supplied by Taylor Farms.
Nearly 7,000 cases of cyclosporiasis — both confirmed and under investigation — have been reported across the country.
The outbreak linked to the lettuce is thought to be a regional one, centered in the Midwest.
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In a statement, Taco Bell says it was removing potentially impacted lettuce in select states.
Taylor Farms did not respond to a request for comment.
Taylor Farms also supplies grocery stores and restaurants across the country, but it’s unclear how many of its products may be affected.
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Federal health officials have said multiple investigations are underway.