Frequency of Antimicrobial-Resistant Fecal Escherichia coli Among Small, Medium, and Large Beef Cow-Calf Operations in Florida.

ABSTRACT: Antimicrobial resistance (AMR) is a growing threat to both animal and human health. This study investigated the occurrence of AMR in Escherichia coli isolated from fecal samples collected from beef cow-calf operations and compared the frequency of antimicrobial-resistant fecal E. coli among small, medium, and large beef cow-calf operations in Florida, United States. The study included nine beef cow-calf operations. Between December 2023 and April 2024, a total of 743 fecal samples were collected from cows (n = 429) and calves (n = 314), either directly from the rectum or from fresh voided feces. From these samples, 3475 E. coli isolates (five isolates/animal) were subjected to antibiotic susceptibility testing using the Kirby-Bauer disk diffusion method.

SUBMITTER: Ali A 

PROVIDER: S-EPMC12844052 | biostudies-literature | 2025 Dec

REPOSITORIES: biostudies-literature