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- W1839977204 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 resistance to imipenem and meropenem (minimum inhibitory concentrations (MICs), 1 μg/ml to 16 μg/ml), compared with the majority of blaOXA-23-like-carrying isolates (MICs, 16 μg/ml to 64 μg/ml for both imipenem and meropenem). All 231 blaOXA carbapenemase gene-harboring isolates belonged to 14 PFGE types (A-N), and three dominant clones A, J, and H accounted for 43.3%, 42.0%, and 8.2% of the tested isolates, respectively. Clone A (sequence type ST92/ST208) with blaOXA-58-like was the most prevalent before 2008. Clone H (ST229) with blaOXA-23-like became striking between 2007 and 2008. Clone J (ST381) with blaOXA-23-like rapidly spread and replaced clones A and H in 2009.This study is the first to reveal that the distinct blaOXA-23-like-carrying A. baumannii ST381 displaced the previously prevalent blaOXA-58-like-carrying A. baumannii ST92/ST208, resulting in the rapidly increasing resistance to carbapenems in A. baumannii in Shenzhen People's Hospital in 2009." @default.
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- W1839977204 date "2015-09-04" @default.
- W1839977204 modified "2023-09-25" @default.
- W1839977204 title "Transition of blaOXA-58-like to blaOXA-23-like in Acinetobacter baumannii Clinical Isolates in Southern China: An 8-Year Study" @default.
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- W1839977204 doi "https://doi.org/10.1371/journal.pone.0137174" @default.
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