The FDA says lettuce distributed by Taylor Fresh Foods and Taylor Farms de Mexico is still linked to the multistate outbreak of cyclosporiasis. But the source may be difficult to definitively trace.

Taylor Farms lettuce was fingered by the FDA as a possible culprit in the national cyclosporiasis outbreak that’s made thousands sick.

Taylor Farms is removing all iceberg lettuce sourced from central Mexico from the U.S. market after it was linked to the cyclosporiasis outbreak.