Abstract

GOMEZ, María Fernanda et al. Aislamientos de Escherichia coli de origen porcino resistentes a antimicrobianos de importancia crítica para la salud pública. Analecta vet. [online]. 2022, vol.42, n.2, e067. ISSN 1514-2590.  http://dx.doi.org/https://doi.org/10.24215/15142590e067.

The goal of this study was to establish the behavior of cefotaxime (CTX)-resistant E. coli and/or colistin-resistant E. coli, isolated from fecal samples of pigs in Argentina to other antimicrobials classified by the WHO as critically important for public health. In 2018, 56 samples from 11 farms located in Buenos Aires, Córdoba, Santa Fe, and San Luis provinces were processed. Thirty-one cefotaxime-resistant E. coli, 21 colistin-resistant E. coli, and 23 cefotaxime-colistin-resistant E. coli were obtained. Sixty-nine percent of the E. coli isolated were resistant to nalidixic acid and 37.3 % to ciprofloxacin, antimicrobials classified as the highest priority. No carbapenem-resistant E. coli were isolated. Seventy-three isolates were classified as multiresistant, of which 50 % showed resistance against 6 or 7 antimicrobial groups. Third-generation cephalosporin resistance was mainly associated with the blaCTX-M gene, particularly blaCTX-M-8/25, while colistin resistance was associated with the mcr-1 gene. The study evidence that Argentinian pigs harbor multidrug-resistant E. coli isolates, including resistance to antimicrobials of critical importance for human and veterinary medicine. Complementary analyses will be necessary to determine extended-spectrum β-lactamase-producing E. coli clones circulating in pig farms and their implications for public health.

Keywords : critically important antimicrobials; Escherichia coli; pigs; antimicrobial resistance.

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