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• W4308548049 abstract "Abstract Carbapenemase-producing Enterobacteriaceae (CPE) are one of the most detrimental species of antibiotic-resistant bacteria worldwide. Phage therapy has emerged as an effective strategy for the treatment of infections caused by CPE pathogens. In west Japan, the increasing occurrence of Klebsiella pneumoniae harboring the pKPI-6 plasmid, which encodes bla IMP-6 , is a growing concern. To manage such major antimicrobial-resistant pathogens, we isolated 29 novel phages from sewage in Japan, targeting 31 strains of K. pneumoniae and one strain of Escherichia coli harboring the pKPI-6 plasmid. Electron microscopy analysis indicated that of the 29 isolated phages, 21 (72.4%), 5 (17.2%), and 3 (10.3%) belonged to Myoviridae, Siphoviridae , and Podoviridae , respectively. Host range analysis revealed that 20 Myoviridae members in isolated phages infected 25–26 strains of K. pneumoniae , indicating that most of the isolated phages have a broad host range. The K. pneumoniae Kp21 can only be infected by phage øKp_21, while Kp22 can be infected by more than 20 phages. We applied a phage cocktail, which consists of 10 phages, against Kp21 and Kp22 and found that the phage cocktail delayed the emergence of phage-resistant bacteria for Kp21 strain but not for the Kp22 strain. Furthermore, phage-resistant Kp21 (Kp21r) became prone to be infected from other bacteriophages as a “trade-off” of resistance to phage øKp_21. Our proposed phage set has an adequate number of phages to combat the K. pneumoniae strain isolated in Japan. Notably, our work demonstrates how a suitable phage cocktail diminishes the occurrence of phage-resistant bacteria. Importance Klebsiella pneumoniae harboring the plasmid carrying bla IMP-6 is becoming an increasingly hazardous species in Japan. We collected and characterized 29 novel bacteriophages that infect K. pneumoniae carrying the pKPI-6 plasmid, isolated in clinical settings of west Japan. Our phages showed broad host ranges. We applied a phage cocktail treatment constructed from 10 phages against two host strains, Kp21 and Kp22, which show different phage susceptibility patterns each other. Although the phage cocktail delayed phage-resistant Kp21 emergence, the emergence of phage-resistant Kp22 could not be delayed. Moreover, phage-resistant Kp21 became sensitive to other phages, which did not originally infect wild-type Kp21. Our study demonstrates how a suitable phage cocktail can diminish the occurrence of phage-resistant bacteria." @default.
• W4308548049 created "2022-11-12" @default.
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• W4308548049 date "2022-11-05" @default.
• W4308548049 modified "2023-09-24" @default.
• W4308548049 title "Isolation and characterization of bacteriophages against IMP-6-producing<i>Klebsiella pneumoniae</i>isolated from clinical settings in Japan" @default.
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• W4308548049 doi "https://doi.org/10.1101/2022.11.05.515272" @default.
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