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- W2396269110 abstract "ABSTRACT Increasing resistance in Gram-negative bacilli, including Klebsiella spp., has reduced the utility of broad-spectrum cephalosporins. Avibactam, a novel non-β-lactam β-lactamase inhibitor, protects β-lactams from hydrolysis by Gram-negative bacteria that produce extended-spectrum β-lactamases (ESBLs) and serine carbapenemases, including Ambler class A and/or class C and some class D enzymes. In this analysis, we report the in vitro activity of ceftazidime-avibactam and comparators against multidrug-resistant (MDR) Klebsiella spp. from the 2012-2014 INFORM surveillance study. Isolates collected from 176 sites were sent to a central laboratory for confirmatory identification and tested for susceptibility to ceftazidime-avibactam and comparator agents, including ceftazidime alone. A total of 2,821 of 10,998 (25.7%) Klebsiella species isolates were classified as MDR, based on resistance to three or more classes of antimicrobials. Among the MDR isolates, 99.4% had an ESBL screen-positive phenotype, and 27.4% were not susceptible to meropenem as an example of a carbapenem. Ceftazidime-avibactam was highly active against MDR isolates, including ESBL-positive and serine carbapenemase-producing isolates, with MIC 50/90 values of 0.5/2 μg/ml and 96.6% of all MDR isolates and ESBL-positive MDR isolates inhibited at the FDA breakpoint (MIC value of ≤8 μg/ml). Ceftazidime-avibactam did not inhibit isolates producing class B enzymes (metallo-β-lactamases) either alone or in combination with other enzymes. These in vitro results support the continued investigation of ceftazidime-avibactam for the treatment of MDR Klebsiella species infections." @default.
- W2396269110 created "2016-06-24" @default.
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- W2396269110 date "2016-08-01" @default.
- W2396269110 modified "2023-10-17" @default.
- W2396269110 title "Assessment of the <i>In Vitro</i> Activity of Ceftazidime-Avibactam against Multidrug-Resistant Klebsiella spp. Collected in the INFORM Global Surveillance Study, 2012 to 2014" @default.
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- W2396269110 doi "https://doi.org/10.1128/aac.02841-15" @default.
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