Molecular characterization of ESBL-producing Escherichia coli isolates from hospital- and community-acquired infections in NW Mexico

We investigated the molecular characteristics of ESBL-producing E. coli (ESBL-PEc) isolates from two hospitals and community settings in Ciudad Obregon, Sonora, Mexico. Between 2011 and 2014, thirty-seven ESBL-PEc isolates were collected. The major encoded ESBL was the bla(CTX-m-15) gene (97%); followed by 13.5% of the bla(SHV-12) gene, and 5.5% encoded the bla(TLA-1) gene. The PMQR gene aac(6')-Ib-cr was detected in 97% of the isolates and the qnrB gene, in one isolate. The ESBL-PEc isolates corresponded to phylogenetic group B2, ST131. Our results highlight the dissemination of ESBL-PEc isolates in northwest Mexico (Ciudad Obregon, Sonora). (C) 2016 Elsevier Inc. All rights reserved.