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Title: In vitro Bactericidal Activities of Combination Antibiotic Therapies Against Carbapenem-Resistant Klebsiella pneumoniae With Different Carbapenemases and Sequence Types
Authors: Teo, Jocelyn Qi-Min
Fauzi, Nazira
Ho, Jayden Jun-Yuan
Tan, Si Hui
Lee, Shannon Jing-Yi
Lim, Tze Peng 
Cai, Yiying 
Chang, Hong Yi
Mohamed Yusoff, Nurhayati
Sim, James Heng-Chiak
Tan, Thuan Tong
Ong, Rick Twee-Hee 
Kwa, Andrea Lay-Hoon 
Keywords: bactericidal
in vitro
Issue Date: 13-Dec-2021
Publisher: Frontiers Media S.A.
Citation: Teo, Jocelyn Qi-Min, Fauzi, Nazira, Ho, Jayden Jun-Yuan, Tan, Si Hui, Lee, Shannon Jing-Yi, Lim, Tze Peng, Cai, Yiying, Chang, Hong Yi, Mohamed Yusoff, Nurhayati, Sim, James Heng-Chiak, Tan, Thuan Tong, Ong, Rick Twee-Hee, Kwa, Andrea Lay-Hoon (2021-12-13). In vitro Bactericidal Activities of Combination Antibiotic Therapies Against Carbapenem-Resistant Klebsiella pneumoniae With Different Carbapenemases and Sequence Types. Frontiers in Microbiology 12 : 779988. ScholarBank@NUS Repository.
Rights: Attribution 4.0 International
Abstract: Carbapenem-resistant Klebsiella pneumoniae (CRKP) is becoming increasingly problematic due to the limited effectiveness of new antimicrobials or other factors such as treatment cost. Thus, combination therapy remains a suitable treatment option. We aimed to evaluate the in vitro bactericidal activity of various antibiotic combinations against CRKP with different carbapenemase genotypes and sequence types (STs). Thirty-seven CRKP with various STs and carbapenemases were exposed to 11 antibiotic combinations (polymyxin B or tigecycline in combination with ?-lactams including aztreonam, cefepime, piperacillin/tazobactam, doripenem, meropenem, and polymyxin B with tigecycline) in static time-kill studies (TKS) using clinically achievable concentrations. Out of the 407 isolate-combination pairs, only 146 (35.8%) were bactericidal (?3 log10CFU/mL decrease from initial inoculum). Polymyxin B in combination with doripenem, meropenem, or cefepime was the most active, each demonstrating bactericidal activity in 27, 24, and 24 out of 37 isolates, respectively. Tigecycline in combination with ?-lactams was rarely bactericidal. Aside from the lower frequency of bactericidal activity in the dual-carbapenemase producers, there was no apparent difference in combination activity among the strains with other carbapenemase types. In addition, bactericidal combinations were varied even in strains with similar STs, carbapenemases, and other genomic characteristics. Our findings demonstrate that the bactericidal activity of antibiotic combinations is highly strain-specific likely owing to the complex interplay of carbapenem-resistance mechanisms, i.e., carbapenemase genotype alone cannot predict in vitro bactericidal activity. The availability of WGS information can help rationalize the activity of certain combinations. Further studies should explore the use of genomic markers with phenotypic information to predict combination activity. Copyright © 2021 Teo, Fauzi, Ho, Tan, Lee, Lim, Cai, Chang, Mohamed Yusoff, Sim, Tan, Ong and Kwa.
Source Title: Frontiers in Microbiology
ISSN: 1664-302X
DOI: 10.3389/fmicb.2021.779988
Rights: Attribution 4.0 International
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