1. First three Escherichia coli isolates harbouring mcr-1 in Uruguay.
- Author
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Papa-Ezdra R, Grill Diaz F, Vieytes M, García-Fulgueiras V, Caiata L, Ávila P, Brasesco M, Christophersen I, Cordeiro NF, Algorta G, Galiana A, and Vignoli R
- Subjects
- Adult, Aged, 80 and over, Cephalosporins pharmacology, Colistin pharmacology, Escherichia coli drug effects, Escherichia coli genetics, Escherichia coli isolation & purification, Escherichia coli Infections blood, Escherichia coli Infections urine, Female, Gene Transfer, Horizontal, Humans, Male, Multilocus Sequence Typing, Rectum microbiology, Retrospective Studies, Uruguay epidemiology, Drug Resistance, Bacterial, Escherichia coli classification, Escherichia coli Infections microbiology, Escherichia coli Proteins genetics
- Abstract
Objective: This report described the first Escherichia coli (E. coli) isolates harbouring mcr-1 in Uruguay., Methods: Three E. coli isolates were obtained from blood, urine and rectal swabs from different patients in two hospitals. Extended-spectrum β-lactamases (ESBL), plasmid-encoded (pAmpC) β-lactamases, plasmid-mediated quinolone resistance (PMQR) genes, class 1 integrons, and mcr-1, mcr-2 and mcr-3 were sought and characterised in three E. coli isolates. Transfer of resistance determinants was assessed by conjugation. Clonality was analysed by multilocus sequence typing., Results: All isolates were categorised as being colistin-resistant and the mcr-1 gene was detected. Two isolates were also resistant to oxyimino cephalosporins: one on account of bla
CMY-2 and the other due to blaCTX-M-15 , the latter also harbouring transferable quinolone-resistance genes (aac(6')Ib-cr and qnrB). All mcr-1 genes were transferred by conjugation to recipient strains. The mcr-1-bearing isolates belonged to sequence types ST10, ST93 and ST5442., Conclusions: ST10 is considered as a high-risk clone worldwide. This type of mcr-1-harbouring clone is a major concern for human and animal health and must be under close surveillance. This study detected the presence of mcr-1 for the first time in Uruguay, albeit in an allodemic manner, associated with different antibiotic-resistance genes and from diverse clinical contexts. Considering that colistin is often the last therapeutic option available for multidrug-resistant Gram-negative bacilli infections, it is important to maximise precautions to avoid dissemination of isolates carrying mcr-1., (Copyright © 2019 International Society for Antimicrobial Chemotherapy. Published by Elsevier Ltd. All rights reserved.) more...- Published
- 2020
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