A tainted mix of celery and onions appears to be at fault for a multi-state E. Coli outbreak.

Taylor Farms Pacific recalled a list of products on Thursday after a link to the outbreak tied to Costco stores was discovered, according to a notice on the Food & Drug Administration website.

The California-based manufacturer produced a diced-vegetable mix that tested positive for E. Coli, according to the posting. It was used in a rotisserie chicken salad that was sold at Costco.

The vast majority of the 19 people infected with the bacteria reported buying or eating the salad before they got sick, according to the Centers for Disease Control and Prevention. Infections have been reported in Montana, Utah, California, Washington, Colorado, Missouri and Virginia.

The recall is being conducted “out of an abundance of caution,” according to the FDA.

Costco has stopped selling and producing the salad, the CDC noted. It encourages anyone who bought the product to throw it out, even if some has been eaten and no one has fallen ill.

The particular strain of E. Coli bacteria associated with the Costco outbreak is known to be deadly.

Reuters reported it’s the same one to blame for the 1993 outbreak at Jack in the Box restaurants. Four children died and hundreds more became sick after eating undercooked hamburgers.

No deaths have been reported this time, but the CDC says five people have been hospitalized and two people have developed a type of kidney failure called hemolytic uremic syndrome.