Celery-onion mix believed to be the source of Costco E.coli outbreak

The Food and Drug Administration says a California farm is recalling a vegetable mix believed to be the source of E.coli in Costco chicken salad that has been linked to an outbreak that has sickened 19 people in seven states.

The FDA said Thursday Taylor Farms Pacific of Tracy, California, recalled a mix of celery and onion used in Costco chicken salad and other foods.

Costco says it uses one supplier for those vegetables in the chicken salad sold in all its U.S. stores.

A message left with Taylor Farms was not immediately returned.

The number of people sickened in the outbreak will likely grow over the next few weeks, even though the product has been removed from store shelves, the federal Centers for Disease Control and Prevention said Wednesday.