Health officials investigating the large outbreak of diarrhea caused by the parasite cyclospora say they have “very strong” evidence that shredded iceberg lettuce supplied by Taylor Farms is the likely source, despite a false positive test for the parasite over the weekend.

Taylor Farms is removing iceberg lettuce sourced from central Mexico after multiple reports citing unnamed sources linked its lettuce to an outbreak.

Michigan health officials reported a staggering 5,002 cases of cyclosporiasis as of Friday, marking an increase of 690 cases in just one day