E. coli recall spreads to Wal-Mart, Starbucks

The source of a an E. coli outbreak spanning seven states has been traced back to a single ingredient in Costco's rotisserie chicken salad: diced celery.

The ingredient from Taylor Farms Pacific of Tracy, Calif., has led to a recall that now includes Wal-Mart, Starbucks, Target, Sam's Club, 7-Eleven and Safeway.

So far, 19 people have been infected with E. coli in California, Colorado, Missouri, Montana, Utah, Virginia and Washington.

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