OXA-51-like β-lactamases and their association with particular epidemic lineages of Acinetobacter baumannii

B A Evans, A Hamouda, K J Towner, S G B Amyes

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Sixty diverse clinical Acinetobacter baumannii isolates of worldwide origin were assigned to sequence groups, based on a multiplex PCR for the ompA, csuE and bla(OXA-51-like) genes. The majority (77%) of isolates belonged to sequence groups 1 and 2 (SG1 and SG2), with sequence group 3 (SG3) and non-grouped isolates accounting for the remainder. The isolates were not closely related according to pulsed-field gel electrophoresis (PFGE), and the majority were sensitive to imipenem and meropenem. The construction of a linkage map of OXA-51-like beta-lactamase sequence relationships revealed two closely related clusters of enzymes, one focused around OXA-66 and the other around OXA-69. Isolates belonging to SG1 encoded an enzyme from the OXA-66 cluster, while those belonging to SG2 encoded an enzyme from the OXA-69 cluster. All SG3 isolates encoded OXA-71, which does not form part of a close enzyme grouping. Major multinational lineages accounted for a significant proportion of A. baumannii clinical isolates, and the evolution of the OXA-51-like enzymes appears to be an ongoing process.

Original languageEnglish
Pages (from-to)268-275
Number of pages8
JournalClinical Microbiology and Infection
Issue number3
Publication statusPublished - Mar 2008


  • Acinetobacter baumannii
  • blaOXA-51-like
  • carbapenemase
  • lineages
  • linkage map
  • sequence groups

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