Multidrug resistance in Escherichia coli carrying integrons isolated from a pig farm with moderate antibiotic use.

DE LA TORRE EULALIA; COLELLO ROCIO; FERNÁNDEZ DANIEL; ETCHEVERRÍA ANALÍA; DI CONZA JOSÉ; GUTKIND GABRIEL; TAPIA MARÍA O.; DIEGUEZ SUSANA; SORACI ALEJANDRO; PADOLA NORA LÍA

JOURNAL OF GENERAL AND APPLIED MICROBIOLOGY

MICROBIOL RES FOUNDATION

Lugar: Tokyo; Año: 2016 vol. 61 p. 270 - 273

0022-1260

The digestive tract of pigs is a complex ecosystem with large species diversity, where the inappropriate use of antibiotics creates a selective pressure on the bacterial flora increasing the emergence of multiresistant bacteria. The aim of this study was to evaluate the susceptibility to antibiotics in commensals Escherichia coliintegron positive isolated from pigs from a pig farm in Argentina.A postpartum sow and five randomly chosen piglets from its litter were sampled by rectal swabs at established time points.All Escherichia coli carrying integrons isolated from the sow showed some antibiotic resistance. Most of the isolates (72.7%) were resistant to one or two antibiotics, whereas isolates obtained from piglets were mostly multiresistant (88.3%). The highest resistance rate was found for tetracycline (96.6%).Analysis of the variable regions of class 1 and class 2 integrons showed different arrangements of gene cassette, which wereaadA1 and dhfrl-sat-aadA1,respectively.These results show a high percentage of antibiotic resistance in the Escherichia coli commensal strains carrying integrons, indicating a risk of transmission through food chain.