The E. coli outbreak traced to Costco chicken salads appears to have been caused by vegetables in the salad, rather than the chicken itself, according to company officials.
Tests performed by the Food and Drug Administration and Montana health officials traced the E. coli to an onion and celery mix, rather than the rotisserie chicken itself, Craig Wilson, Costco's vice president of food safety and quality assurance, told USA TODAY. Health officials are performing additional tests to confirm this link.
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