Which of the following lists accurately names the four major bacterial species monitored by the National Antimicrobial Resistance Monitoring System (NARMS) in retail meat surveillance?

• A. Salmonella; Escherichia coli; Campylobacter; Enterococcus
• B. Salmonella; Shigella; Campylobacter; Listeria
• C. Salmonella; Escherichia coli; Shigella; Enterococcus
• D. Staphylococcus aureus; Escherichia coli; Campylobacter; Enterococcus

Answer: (A)

The main idea here is understanding which bacteria are routinely tracked in retail meat surveillance by NARMS and why these four were chosen. Salmonella and Campylobacter are number one and number two as causes of human illness linked to meat; they’re common, important to monitor, and have well-established patterns of antimicrobial resistance that impact treatment and public health responses. Escherichia coli is included because it represents Gram-negative enteric bacteria found in the gut of animals and humans and serves as a useful indicator for resistance trends across similar organisms, including pathogenic strains. Enterococcus is a Gram-positive genus that can harbor resistance and serves as a complementary sentinel alongside the Gram-negative pathogens, helping to reveal broader resistance patterns in the food chain.

Other organisms listed in the alternatives aren’t part of the standard retail meat panel for NARMS. Shigella and Listeria, for example, aren’t the primary targets in this specific retail meat surveillance, and Staphylococcus aureus isn’t included in this set for monitoring resistance in meat products. The combination of Salmonella, Escherichia coli, Campylobacter, and Enterococcus provides a broad, representative view of antimicrobial resistance in meat-associated bacteria that are most relevant to human disease risk.