• Cars fill the parking lot of a Costco store, Tuesday, Nov. 24, 2015, in Seattle. Health authorities say chicken salad from Costco has been linked to at least one case of E. coli in Washington state.  (AP Photo/Ted S. Warren)

    Costco: FDA tests point toward E. coli in salad vegetables

    SEATTLE (AP) — Testing has pointed toward a vegetable mix from a California food wholesaler as the source of E. coli in Costco chicken salad that has been linked to an outbreak that has sickened 19 people in seven states, a Costco official said Wednesday.