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Thein vitro activities of ceftazidime-avibactam and comparators against 9,149 isolates ofEnterobacteriaceae and 2,038 isolates ofPseudomonas aeruginosa collected by 42 medical centers in nine countries in the Asia-Pacific region from 2012 to 2015 were determined as part of the International Network for Optimal Resistance Monitoring (INFORM) global surveillance program. Antimicrobial susceptibility testing was conducted by Clinical and Laboratory Standards Institute (CLSI) broth microdilution, and isolate subset analysis was performed on the basis of the resistant phenotypes and β-lactamase content. Ceftazidime-avibactam demonstrated potentin vitro activity (MIC, ≤8 μg/ml) against allEnterobacteriaceae tested (99.0% susceptible) and was the most active against isolates that were metallo-β-lactamase (MBL) negative (99.8% susceptible). AgainstP. aeruginosa , 92.6% of all isolates and 96.1% of MBL-negative isolates were susceptible to ceftazidime-avibactam (MIC, ≤8 μg/ml). The rates of susceptibility to ceftazidime-avibactam ranged from 97.0% (Philippines) to 100% (Hong Kong, South Korea) forEnterobacteriaceae and from 83.1% (Thailand) to 100% (Hong Kong) amongP. aeruginosa isolates, with lower susceptibilities being observed in countries where MBLs were more frequently encountered (Philippines, Thailand). Ceftazidime-avibactam inhibited 97.2 to 100% ofEnterobacteriaceae isolates, per country, that carried serine β-lactamases, including extended-spectrum β-lactamases, AmpC cephalosporinases, and carbapenemases (KPC, GES, OXA-48-like). It also inhibited 91.3% ofP. aeruginosa isolates that were carbapenem nonsusceptible in which no acquired β-lactamase was detected. Among MBL-negativeEnterobacteriaceae isolates that were ceftazidime nonsusceptible, meropenem nonsusceptible, colistin resistant, and multidrug resistant, ceftazidime-avibactam inhibited 96.1, 87.7, 100, and 98.8% of isolates, respectively, and among MBL-negativeP. aeruginosa isolates that were ceftazidime nonsusceptible, meropenem nonsusceptible, colistin resistant, and multidrug resistant, ceftazidime-avibactam inhibited 79.6, 83.6, 83.3, and 68.2% of isolates, respectively. Overall, clinical isolates ofEnterobacteriaceae andP. aeruginosa collected in nine Asia-Pacific countries from 2012 to 2015 were highly susceptible to ceftazidime-avibactam.

antimicrobial agents and chemotherapy

<i>In Vitro</i> Activity of Ceftazidime-Avibactam against Clinical Isolates of Enterobacteriaceae and Pseudomonas aeruginosa Collected in Asia-Pacific Countries: Results from the INFORM Global Surveillance Program, 2012 to 2015

In Vitro Activity of Ceftazidime-Avibactam against Clinical Isolates of Enterobacteriaceae and Pseudomonas aeruginosa Collected in Asia-Pacific Countries: Results from the INFORM Global Surveillance Program, 2012 to 2015