Plasmid-mediated mcr-1 in carbapenem-susceptible Escherichia coli ST156 causing a blood infection: an unnoticeable spread of colistin resistance in Brazil?

Authors

  • Flavia Rossi Universidade de São Paulo; Setor de Microbiologia, Hospital das Clinicas HCFMUSP, Faculdade de Medicina; Divisao Laboratorio Central - LIM03
  • Raquel Girardello Universidade de São Paulo; Setor de Microbiologia, Hospital das Clinicas HCFMUSP, Faculdade de Medicina; Divisao Laboratorio Central - LIM03
  • Carlos Morais Universidade de São Paulo; Nucleo de Apoio a Pesquisa em Biologia Computacional e Genomica (NUBIC)
  • Ana Paula Cury Universidade de São Paulo; Setor de Microbiologia, Hospital das Clinicas HCFMUSP, Faculdade de Medicina; Divisao Laboratorio Central - LIM03
  • Layla Farage Martins Universidade de São Paulo; Instituto de Química; Departamento de Bioquímica
  • Aline Maria da Silva Universidade de São Paulo; Instituto de Química; Departamento de Bioquímica
  • Edson Abdala Universidade de São Paulo; Hospital das Clinicas HCFMUSP, Faculdade de Medicina; Instituto do Cancer do Estado de Sao Paulo
  • João Carlos Setubal Universidade de São Paulo; Nucleo de Apoio a Pesquisa em Biologia Computacional e Genomica (NUBIC)
  • Alberto José da Silva Duarte Universidade de São Paulo; Setor de Microbiologia, Hospital das Clinicas HCFMUSP, Faculdade de Medicina; Divisao Laboratorio Central - LIM03

DOI:

https://doi.org/10.6061/clinics/2017(10)09

Keywords:

Colistin Resistance, Polymyxin Resistance, Escherichia Coli, Carbapenem-Susceptible, ST156

Abstract

OBJECTIVE: We describe an IncX4 pHC891/16mcr plasmid carrying mcr-1 in a colistin-resistant and carbapenem-susceptible E. coli isolate (HC891/16), ST156, which caused a blood infection in a Brazilian patient with gallbladder adenocarcinoma. METHODS: Strain HC891/16 was subjected to whole genome sequencing using the MiSeq Platform (Illumina, Inc., USA). Assembly was performed using Mira and ABACAS. RESULTS: The isolates showed resistance only to ciprofloxacin, ampicillin and cefoxitin, and whole-genome sequencing revealed the presence of aac(6’)Ib-cr and blaTEM1. CONCLUSION: Our findings warn of the possible silent dissemination of colistin resistance by carbapenem-susceptible mcr-1 producers, as colistin susceptibility is commonly tested only among carbapenem-resistant isolates.

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Published

2017-10-01

Issue

Vol. 72 No. 10 (2017)

Section

Rapid Communication

How to Cite

Plasmid-mediated mcr-1 in carbapenem-susceptible Escherichia coli ST156 causing a blood infection: an unnoticeable spread of colistin resistance in Brazil?. (2017). Clinics, 72(10), 642-644. https://doi.org/10.6061/clinics/2017(10)09