Reuters: A multi-state E. coli outbreak that has sickened at least 19 people who ate rotisserie chicken salad sold at Costco Wholesale Corp’s stores has been traced to a celery-and-onion mix used in the salad, prompting its California maker to recall the product.

The recall notice, posted on Thursday on the website of the U.S. Food and Drug Administration, said a sample of the diced vegetable blend examined by Montana state health authorities tested positive for the E. coli O157:H7 strain behind the recent outbreak.

At least five of the 19 people who have fallen ill this month have been hospitalized. Although no deaths have been reported, two individuals developed hemolytic uremic syndrome, or HUS, a type of kidney failure that can lead to permanent organ damage.

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