CDC: Drug-resistant Salmonella Outbreak from Foster Farms Chicken Affected 416

The U.S. Centers for Disease Control and Prevention (CDC) today posted an Investigation Update on the multistate outbreak of multidrug-resistant Salmonella Heidelberg infections linked to Foster Farms brand chicken that was initially reported in early October. To date, 416 individuals have been affected (an increase of 27 from the Nov. 19 update), in 23 states and Puerto Rico.

Given the available background information, the CDC said that illness onset dates range from March 1 to Dec. 1, 2013. Among 340 persons with available information, 134 (39%) reported being hospitalized. Thirteen percent of ill persons have developed blood infections as a result of their illness, whereas typically, approximately 5% of persons ill with Salmonellosis develop blood infections. No deaths have been reported.

CDC's update also noted that the agency's National Antimicrobial Resistance Monitoring System for Enteric Bacteria (NARMS) laboratory continues to conduct antimicrobial susceptibility testing on clinical isolates collected from ill persons infected with all seven of the outbreak strains. The update explained:

Of 34 isolates tested to date, 19 (56%) of these isolates exhibited resistance to one or more antibiotics. Seven (21%) of the 34 isolates were multidrug resistant. To date, isolates collected from ill persons were resistant to combinations of the following antibiotics: ampicillin, chloramphenicol, gentamicin, kanamycin, streptomycin, sulfisoxazole, and tetracycline. Antibiotic resistance may increase the risk of hospitalization or possible treatment failure in infected individuals.

Seven strains of Salmonella Heidelberg bacteria have been identified as being linked to this outbreak. Ill persons infected with each of the seven strains were linked to consumption Foster Farms chicken. Four of these strains are rarely reported to PulseNet. The other three strains are more common, with several ill persons infected with each strain reported to CDC monthly. The number of reported cases for these three strains was significantly higher than the number of cases expected during the outbreak period. Since illnesses due to several strains are more commonly reported, not all may be linked to consumption of Foster Farms chicken and may be part of the expected number of illnesses reported during this period.

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