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Background   Acinetobacter baumannii  strains co-producing carbapenemase and 16S rRNA methylase are highly resistant to carbapenems and aminoglycosides.    Methods  Ninety-three isolates of multidrug-resistant  A. baumannii  were obtained from an intensive care unit in a hospital in Vietnam. Antimicrobial susceptibility tests and whole genome sequencing were performed. Multilocus sequence typing and the presence of drug resistant genes were determined and a maximum-likelihood phylogenetic tree was constructed by SNP alignment of whole genome sequencing data.    Results  The majority of isolates belonged to clonal complex 2 (ST2, ST570 and ST571), and carried carbapenemase encoding genes  bla  OXA-23  and  bla  OXA-66 . Two isolates encoded carbapenemase genes  bla  NDM-1  and  bla  OXA-58  and the 16S rRNA methylase encoding gene  armA  and did not belong to clonal complex 2 (ST16).    Conclusion   A. baumannii  isolates producing 16S rRNA methylase ArmA and belonging to clonal complex 2 are widespread, and isolates co-producing NDM-1 and ArmA are emerging, in medical settings in Vietnam.    Electronic supplementary material  The online version of this article (doi:10.1186/s12879-015-1171-x) contains supplementary material, which is available to authorized users.

Dissemination of clonal complex 2 Acinetobacter baumannii strains co-producing carbapenemases and 16S rRNA methylase ArmA in Vietnam