Public health investigators are using DNA
“fingerprints” of Salmonella Braenderup obtained through diagnostic
testing with pulsed-field gel electrophoresis, or PFGE, to identify cases of
illness that may be part of this outbreak. They are using data from PulseNet,
the national subtyping network made up of state and local public health
laboratories and federal food regulatory laboratories that performs molecular
surveillance of foodborne infections.
Collaborative investigation efforts of
state, local, and federal public health and regulatory agencies indicate that mangoes
are a likely source of this outbreak.
A total of 103 persons infected with the
outbreak strain of Salmonella Braenderup
have been reported from 16 states. The majority of ill persons (78) have been
reported from California. This number may change as more cases are confirmed.
Most persons became ill during July. Among persons for whom information is
available, illness onset dates range from July 3, 2012 to August 11, 2012. Ill
persons range in age from 1 to 86 years, with a median age of 32 years old.
Fifty-five percent of ill persons are female. Among 69 persons with available information,
25 (36%) patients reported being hospitalized. No deaths have been reported.
This PFGE pattern has been seen before in
PulseNet, and in the past typically caused 2 to 3 cases per month. Therefore,
some reported cases may not be part of this outbreak. Illnesses that occurred
after August 5, 2012, might not be reported yet due to the time it takes
between when a person becomes ill and when the illness is reported.
Investigation
of the Outbreak:
State public health officials are interviewing ill persons to obtain
information regarding foods they might have eaten and other exposures in the
week before illness. Preliminary information indicates that mangoes are a
likely source for the Salmonella Braenderup infections. Approximately 70% of
ill persons interviewed report consuming mangoes in the week before becoming
ill. Among ill persons in California, approximately 80% are of Hispanic
ethnicity. Many of the ill persons in California report purchasing mangoes from
Hispanic markets or grocery stores. Investigations are ongoing to determine the
specific type and source of mangoes that might be linked with illness.
CDC and state and local public health
partners are continuing laboratory surveillance through PulseNet to identify
additional ill persons and to interview ill persons about foods eaten before
becoming ill. FDA is continuing to work closely with CDC and state partners
during this investigation. CDC will update the public on the progress of this
investigation as information becomes available.