Global distribution of antimicrobial resistance in pathogenic Escherichia coli isolated from calves: a systematic review

Dircéia A.C. Custódio,A. Ferreira,M. Gonçalves,Anna Cecília Trolesi Reis Borges Costa,C. Pereira,F. Coura,A. Lage,G. M. Costa,E. M. Dorneles

Published 2025 in Pesquisa Veterinária Brasileira

ABSTRACT

ABSTRACT: The present study aimed to perform a systematic review to determine the antimicrobial resistance (AMR) profile of pathogenic Escherichia coli strains isolated from the intestinal tract of calves worldwide. Six databases were systematically searched (CABI, Cochrane, PubMed, SciELO, Scopus and Web of Science) with no restrictions regarding the year or place of the publications. A total of 932 studies were recovered, and 56 articles, published from 1982 to 2020, were included in this systematic review. These articles were selected based on title, abstract and full text. The most used technique to determine the susceptibility to antimicrobials of E. coli strains was the disk diffusion test (83.93%, 47/56), followed by the minimum inhibitory concentration (MIC) test (19.64%, 11/56). Only two studies (3.57%, 2/56) performed both tests. Seventy-seven different antimicrobial drugs of 17 classes were tested using disk diffusion methodology. For the MIC, fifteen antimicrobial classes and sixty-one antimicrobial drugs were tested. Cephalosporins were the most tested antimicrobial class, both by disk diffusion and MIC methods. Antimicrobial classes with the highest resistance levels were observed for tetracyclines, penicillins, folate inhibitors, aminoglycosides, phenicols and fluoroquinolones. Due to the heterogeneity and low quality of the studies, mainly regarding the antimicrobial susceptibility test methodology used, it was not possible to perform a meta-analysis. The findings showed the global spread of antimicrobial resistance in pathogenic E. coli from calves and indicate the importance of carrying out studies based on well-designed analyses to better understand the real emergence and spread of AMR in this pathogen.

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