Antimicrobial drug use and its association with antimicrobial resistance in fecal commensals from cows on California dairies.

ABSTRACT: The current study objective was to investigate the risk factors associated with the isolation of antimicrobial-resistant Escherichia coli, Enterococcus spp., and Streptococcus spp. (ES) from the feces of dairy cows in California (CA). A longitudinal study was conducted on ten dairies, and a random sample of cattle (late pregnant heifers and dry cows) stratified by each herd's parity distribution were followed monthly from close-up to 120 days in milk during fall to winter 2018 (winter season) and spring to summer 2019 (summer season). Gastrointestinal commensals were isolated from fecal samples and tested for antimicrobial susceptibility using the broth microdilution method against a selected panel of antimicrobial drugs (AMD). Eight dairies used blanket AMD therapy at

SUBMITTER: Abdelfattah EM 

PROVIDER: S-EPMC11848851 | biostudies-literature | 2024

REPOSITORIES: biostudies-literature