Abstract
Background With the incidence of antibiotic resistance reaching crisis point, it is imperative to find alternative treatments for multidrug-resistant infections. Using phage for pathogen control might be a promising treatment option to combat bacterial resistance. Results In this study, a lytic phage, designated vB_KpnM _Bp5, was isolated from pig faecal sample in Nanning, Guangxi province of China, and classified as a member of the family Muscle virus based on electron microscopy analysis. A one-step growth curve of the phage at the optimal MOI revealed that the latent time was 40 min and the burst size was 24 PFU/cell, indicative of good lysis capacity. Whole genome sequencing showed that phage vB_KpnM _Bp5 had a small dsDNA genome of 43872 bp. BLASTn analysis showed that it shared 94.06% identity (94% genome coverage) with Klebsiella phage vB_KpnP_SU552A of complete genome idefix. RAST genome analysis showed that the phage had 50 ORFs due to its small genome size, and the number of functional proteins was consistent with other phages. To evaluate the therapeutic effect of Klebsiella pneumoniae infection in mice, the results showed that phages provided vB_KpnM _Bp5better protection. Conclusion The phage vB_KpnM _Bp5 had the characteristics of broad host spectrum, strong environmental adaptability, short incubation period, large outbreak amount, and can cure the mouse model infected by Klebsiella pneumoniae. These findings suggested that phage vB_KpnM _Bp5 could be considered a potential therapeutic or prophylactic candidate against Klebsiella pneumonia infection.
Genome analysis of a multidrug-resistant Streptococcus sanguis isolated from a throat swab of a child with scarlet fever
