This study examined the antimicrobial resistance properties of 17 Acinetobacter baumannii isolates obtained over 2 months from 2 military hospitals in Rawalpindi, Punjab Province, Pakistan, with a particular focus on carbapenem resistance. Susceptibility testing found that 14 of the 17 A. baumannii isolates were multidrug-resistant, being resistant to either 4 (2 isolates) or 5 (12 isolates) different classes of drugs. Of the A. baumannii isolates, 11 (65%) were resistant to meropenem or imipenem, which was associated with the carriage of a blaOXA-23 gene (P85%. The presence of the blaOXA-23 gene in multiple distantly related A. baumannii isolates suggests that its widespread nature cannot be ascribed to the spread of a dominant clone, but rather to the dissemination of multiple carbapenem-resistant lineages.
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