Rise of multidrug-resistant Salmonella strains in U.S. retail chicken meat

Antimicrobial Resistance News

Rise of multidrug-resistant Salmonella strains in U.S. retail chicken meat
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Salmonella infections are a major public health issue in the United States, causing over 1.3 million illnesses annually.

Carl R. Woese Institute for Genomic Biology, University of Illinois at Urbana-ChampaignJul 18 2024 Salmonella infections are a major public health issue in the United States, causing over 1.3 million illnesses annually. These infections are a leading cause of foodborne illness, often traced back to raw or undercooked poultry meat and eggs.

To monitor Salmonella's presence and antimicrobial resistance in retail chicken meat, the National Antimicrobial Resistance Monitoring System for Enteric Bacteria has been sampling chickens since 2002. Longitudinal datasets like these are invaluable for tracking changes in the bacteria over time, said Varga.

While the average prevalence of S. Kentucky and S. Enteritis has remained relatively stable over the years, the researchers observed a significant decline in S. Typhimurium and a dramatic increase in S. Infantis from 2013 to 2020. "S. Infantis has become increasingly prevalent and has recently emerged as multidrug-resistant due to a plasmid within that serovar," said Sohail. "This plasmid contains several antimicrobial resistance and virulence genes, that help with the pathogenesis of S. Infantis. This is likely why it is increasing in prevalence not only in the United States but also across the globe."

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