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- W2895898986 abstract "The emergence of carbapenem resistance in non-baumannii Acinetobacter has increased in clinical settings worldwide. We investigated the prevalence and mechanisms of carbapenem resistance in A. pittii and A. nosocomialis Thai isolates.Acinetobacter calcoaceticus-Acinetobacter baumannii (Acb) complex isolates were identified by gyrB mulitplex PCR. Carbapenem susceptibilities were studied by the agar dilution method and carbapenemase genes were detected by multiplex PCR. Reductions of the outer membrane proteins (OMPs) were evaluated by SDS-PAGE. Overexpressions of efflux pumps were detected by using efflux pump inhibitors and RT-PCR.Of the 346 Acb isolates, 22 and 19 were A. pittii and A. nosocomialis, respectively. The carbapenem resistance rates were 22.7 % in A. pittii and 26.3 % in A. nosocomialis. Three carbapenem-resistant A. pittii carried blaOXA-23. One carbapenem-resistant A. pittii harboured blaOXA-58, while another isolate co-harboured blaOXA-58 and blaIMP-14a. blaOXA-58 was also found in three carbapenem-susceptible A. pittii. Five carbapenem-resistant A. nosocomialis carried blaOXA-23. Eighteen A. pittii isolates carried blaOXA-213-like. Reduced OMPs were found in carbapenem-resistant and -susceptible A. pittii carrying blaOXA-58, but were not detected in carbapenem-resistant A. nosocomialis isolates. Overexpression of adeE was found in carbapenem-resistant A. pittii. No efflux pump genes were present in carbapenem-resistant A. nosocomialis.The major mechanisms of carbapenem resistance in A. pittii and A. nosocomialis were the production of OXA-23 and OXA-58. Overexpression of adeE played a role in carbapenem resistance in A. pittii. Since blaOXA-58 was found in carbapenem-susceptible A. pittii, using carbapenems in the treatment of A. pittii infection should be considered." @default.
- W2895898986 created "2018-10-26" @default.
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- W2895898986 date "2018-12-01" @default.
- W2895898986 modified "2023-10-16" @default.
- W2895898986 title "Mechanisms of carbapenem resistance in Acinetobacter pittii and Acinetobacter nosocomialis isolates from Thailand" @default.
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- W2895898986 doi "https://doi.org/10.1099/jmm.0.000845" @default.
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