19 sickened with E. coli O157 from
chicken salad: Source not IDed but fast recall by Costco may have limited
outbreak
Posted by Doug Powell on 12/22/2015 from Barfblog
The U.S. Centers
for Disease Control, the U.S. Food and Drug Administration (FDA),
the U.S. Department of Agriculture Food Safety and Inspection Service, and
public health officials in several states investigated an outbreak of Shiga
toxin-producing Escherichia coli O157:H7 (STEC O157:H7) infections.
Public health
investigators used the PulseNet system to identify illnesses that
were part of this outbreak. PulseNet, the national subtyping network of public
health and food regulatory agency laboratories, is coordinated by CDC. DNA
fingerprinting is performed on E. coli bacteria isolated from ill
people by using a technique called pulsed-field gel electrophoresis, or PFGE.
PulseNet manages a national database of these DNA fingerprints to identify
possible outbreaks.
One DNA fingerprint
(outbreak strain) was included in this investigation. 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.
State and local public
health officials interviewed ill people to obtain information about foods they
might have eaten and other exposures in the week before their illness started.
Fourteen (88%) of 16 people purchased or ate rotisserie chicken salad from
Costco.
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. This
voluntary action taken by Costco may have prevented additional illnesses.
Costco also worked in collaboration with public health officials
during the investigation by providing records and information related to
ingredient suppliers to try to determine the source of the outbreak.
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.
This outbreak appears
to be over.
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