A total of 19 people infected with the outbreak strain of Shiga toxin-producing STEC O157:H7 were reported from seven states. The majority of illnesses were reported from the western United States. The number of ill people reported from each state was as follows: California (1), Colorado (4), Missouri (1), Montana (6), Utah (5), Virginia (1), and Washington (1).
Among people for whom information was available, illnesses started on dates ranging from October 6, 2015 to November 3, 2015. Ill people ranged in age from 5 years to 84, with a median age of 18. Fifty-seven percent of ill people were female. Five (29%) people were hospitalized, and two people developed hemolytic uremic syndrome, a type of kidney failure. No deaths were reported.
The epidemiologic evidence collected during this investigation suggested that rotisserie chicken salad made and sold in Costco stores was the likely source of this outbreak.
On November 20, 2015, Costco reported to public health officials that the company had removed all remaining rotisserie chicken salad from all stores in the United States.
The Montana Public Health Laboratory tested a sample of celery and onion diced blend produced by Taylor Farms Pacific, Inc. and collected from a Costco store in Montana. Preliminary results indicated the presence of E. coli O157:H7. This product was used to make the Costco rotisserie chicken salad eaten by ill people in this outbreak. According to the FDA, further laboratory analysis was unable to confirm the presence of E. coli O157:H7 in the sample of celery and onion diced blend.
As a result of the preliminary laboratory results and out of an abundance of caution, on November 26, 2015, Taylor Farms Pacific, Inc. voluntarily recalled the celery and onion diced blend and many other products containing celery because they might be contaminated with E. coli O157:H7.
The FDA conducted a traceback investigation of the FDA regulated ingredients used in the chicken salad to try to determine which ingredient was linked to illness. However, the traceback investigation did not identify a common source of contamination.