The Food and Drug Administration said on Saturday a sample of shredded iceberg lettuce supplied by Taylor Farms has tested positive for a parasitic illness that ‌has sickened thousands of people in the U.S.

Taylor ​Farms has confirmed that this product is not part of its current recall, ⁠the FDA said in the statement as it ​seeks to curtail the largest foodborne illness outbreak in ⁠the United States in recent years.

The California-based lettuce supplier is working to identify whether any part of the sample that ‌tested positive is available in commerce or in ​consumers' homes, the ‌FDA said in its most recent update.

Earlier in the day, the ‌supplier posted a list of lettuce products that had been recalled following investigations that it was a potential ⁠source of contamination.

Taylor ‌Farms was not ⁠immediately available for comment.

The FDA said the sample was ⁠collected ⁠during targeted surveillance while investigating the ongoing outbreak and that the positive lot ‌has been detained.

Cyclosporiasis which has been linked to shredded iceberg lettuce served at Yum Brands Taco Bell restaurants ‌in Indiana, Kentucky, ​Michigan, Ohio and ‌West Virginia has so far resulted in around 100 hospitalizations and no deaths, according to ​the Centers for Disease Control and Prevention.