The prevalence and antimicrobial resistance of respiratory pathogens isolated from feedlot cattle in Canada.

ABSTRACT:

Objectives

The purpose of this study was to characterize the prevalence of antimicrobial resistance in Mannheimia haemolytica, Pasteurella multocida, and Histophilus somni isolated from healthy feedlot cattle over 2 years, and investigate factors potentially associated with recovery of resistant isolates.

Methods

Deep-guarded nasopharyngeal (NP) swabs were used to sample feedlot cattle in multiple randomly selected feedlots (2019 n = 21, 2020 n = 26) at 2 timepoints. NP swabs were collected from 16 animals in each enrolled group upon entry processing and later in the feeding period. Cattle from the same groups (not necessarily the same animals) were sampled at both timepoints. Susceptibility testing was performed using the broth microdiluti

SUBMITTER: Rattanapanadda P 

PROVIDER: S-EPMC11810952 | biostudies-literature | 2025

REPOSITORIES: biostudies-literature