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Klebsiella pneumoniae  ( K. pneumoniae ) is an important nosocomial and community acquired opportunistic pathogen which causes various infections. The emergence of multi-drug resistant (MDR)  K. pneumoniae  and carbapenem-resistant hypervirulent  K. pneumoniae  (CR-hvKP) has brought more severe challenge to the treatment of  K. pneumoniae  infection. In this study, a novel bacteriophage that specifically infects  K. pneumoniae  was isolated and named as vB_KpnM_P-KP2 (abbreviated as P-KP2). The biological characteristics of P-KP2 and the bioinformatics of its genome were analyzed, and then the therapeutic effect of P-KP2 was tested by animal experiments. P-KP2 presents high lysis efficiency  in vitro . The genome of P-KP2 shows homology with nine phages which belong to “ KP15 virus ” family and its genome comprises 172,138 bp and 264 ORFs. Besides, P-KP2 was comparable to gentamicin in the treatment of lethal pneumonia caused by  K. pneumoniae  W-KP2 (K47 serotype). Furthermore, the combined treatment of P-KP2 and gentamicin completely rescued the infected mice. Therefore, this study not only introduces a new member to the phage therapeutic library, but also serves as a reference for other phage-antibiotic combinations to combat MDR pathogens.

Combination Therapy of Phage vB_KpnM_P-KP2 and Gentamicin Combats Acute Pneumonia Caused by K47 Serotype Klebsiella pneumoniae