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CFAASP Resources

We convert surveillance results into useful information for participating feedlot producers and veterinarians, the Canadian beef industry, bovine practitioners, researchers, Public Health Agency of Canada, and other stakeholders (e.g., reports, infographics/fact sheets, webinars, podcasts).

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Publish Date: Aug/25/2025

Bovine Respiratory Disease (BRD) Pathogen Antimicrobial Resistance (AMR) Update: CFAASP 2024

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Mannheima haemolytica (Mh), Pasteurella multocida (Pm), and Histophilus somni (Hs) bacteria were isolated from deep nasopharyngeal swabs of cattle at feedlot arrival and rehandling, ~66 days on feed (DOF) .
The nasal isolation rate of Pm and Hs increased from arrival to rehandling.
Susceptibility to all tested antimicrobials from arrival to rehandling decreased by 26% for Mh, 21% for Pm, and 1% for Hs, with susceptibility reductions larger in calves than yearlings for Mh and Pm.