Abstract
The prevalence of carbapenem-resistant Acinetobacter baumannii in hospitals has been increasing worldwide. This study aims to investigate the carbapenemase genes and the clonal relatedness among A. baumannii clinical isolates in a Chinese hospital. Carbapenemase genes and the upstream locations of insertion sequences were detected by polymerase chain reaction (PCR), and the clonal relatedness of isolates was determined by pulsed-field gel electrophoresis (PFGE) and multilocus sequence typing. A total of 231 nonduplicate carbapenemase gene-harboring A. baumannii clinical isolates recovered from Shenzhen People's Hospital, were investigated between 2002 and 2009. blaOXA-23-like, blaOXA-58-like, blaOXA-40-like, and ISAba1-blaOXA-51-like were identified in 119, 107, 1, and 4 isolates, respectively. IS1008-ΔISAba3, ISAba3, and ISAba1 were detected upstream of the blaOXA-58-like gene in 69, 35, and 3 isolates, respectively. All blaOXA-23-like genes but one had an upstream insertion of ISAba1. blaOXA-58-like was the most common carbapenemase gene in A.baumannii before 2008, thereafter blaOXA-23-like became rapidly prevalent and replaced blaOXA-58-like in 2009. The majority of blaOXA-58-like-carrying isolates showed lower level of resi...Continue Reading
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