Antibacterial activity of polymyxin B in combination with several antimicrobial agents against carbapenem-resistant Klebsiella pneumoniae in vitro
WU Zhenghai1, LIU Haiyang1, CHEN Huale2, DUAN Darong3, ZHOU Tieli1.
1.Laboratory Medicine Center, the First Affiliated Hospital of Wenzhou Medical University, Wenzhou, 325015; 2.Laboratory Medicine Center, the Second Affiliated Hospital of Wenzhou Medical University, Wenzhou, 325027; 3.Laboratory Medicine Center, the First People’s Hospital of Taizhou, Taizhou, 318020
WU Zhenghai,LIU Haiyang,CHEN Huale, et al. Antibacterial activity of polymyxin B in combination with several antimicrobial agents against carbapenem-resistant Klebsiella pneumoniae in vitro[J]. JOURNAL OF WEZHOU MEDICAL UNIVERSITY, 2017, 47(12): 898-901.
Abstract:Objective: To evaluate the combined inhibitory effect of polymyxin B with meropenem and rifampicin respectively against carbapenem-resistant Klebsiella pneumoniae (CRKP) strains in vitro. Methods: Combined inhibitory effect of polymyxin B and meropenem, polymyxin B and rifampicin in vitro was assayed by detecting the minimum inhibitory concentration and calculating the fractional inhibitory concentration index for 20 CRKP strains with the checkerboard dilution method. Results: Combined polymyxin B and meropenem showed 55% synergic effect, 45% additive effect, no indifferent and antagonistic effect on CRKP strains. Combined polymyxin B and rifampicin displayed 65% synergic effect, 35% additive effect, no indifferent and antagonistic effect on CRKP strains. Conclusion: Combined polymyxin B and meropenem, combined polymyxin B and rifampicin show a combined synergic and additive inhibitory on CRKP strain in vitro.
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