Molecular epidemiology of carbapenem-resistant Pseudomonas aeruginosa carrying metallo-beta-lactamase genes in Taiwan

Diagn Microbiol Infect Dis. 2007 Oct;59(2):211-6. doi: 10.1016/j.diagmicrobio.2007.01.009. Epub 2007 May 22.

Abstract

Seventy-two isolates of carbapenem-resistant Pseudomonas aeruginosa (CRPA) collected through the Taiwan Surveillance of Antimicrobial Resistance (TSAR) program in 2000 and 2002 were studied for carriage of metallo-beta-lactamase (MBL), integrase genes, and integrons. Epidemiologic relatedness was determined using pulsed-field gel electrophoresis. The prevalence of the MBL genes among CRPA was 36.0% (9 of 25) in TSAR II and 17.0% (8/47) in TSAR III, with prevalence in surveyed hospitals being 19.1% (4/21, TSAR II) and 23.1% (6 of 26, TSAR III). The bla(VIM-3) was detected in 15 of the 17 MBL-positive isolates; the remainder possessed bla(VIM-2). The bla(IMP) was not evident. Class 1 integron was detected in all MBL-positive isolates; amplicon DNA sequences containing the bla(VIM-3) regions were all identical. All MBL-positive isolates remained susceptible to colistin. Molecular typing revealed a predominant strain that comprised 14 of the isolates among the various surveyed hospitals.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Anti-Bacterial Agents / pharmacology*
  • Carbapenems / pharmacology*
  • Colistin / pharmacology
  • Electrophoresis, Gel, Pulsed-Field
  • Humans
  • Integrases / genetics
  • Integrons / genetics
  • Microbial Sensitivity Tests
  • Molecular Epidemiology*
  • Population Surveillance
  • Prevalence
  • Pseudomonas Infections / epidemiology*
  • Pseudomonas Infections / microbiology
  • Pseudomonas aeruginosa / classification
  • Pseudomonas aeruginosa / drug effects*
  • Pseudomonas aeruginosa / genetics
  • Taiwan / epidemiology
  • beta-Lactam Resistance / genetics*
  • beta-Lactamases / genetics

Substances

  • Anti-Bacterial Agents
  • Carbapenems
  • Integrases
  • beta-Lactamases
  • Colistin