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The Streptococcus agalactiae outbreak in tilapia has caused huge losses in the aquaculture industry worldwide. In Malaysia, several studies have reported the isolation of S. agalactiae , but no study has reported the isolation of S. agalactiae phages from tilapia or from the culture pond. Here, the isolation of the S. agalactiae phage from infected tilapia is reported and it is named as vB_Sags-UPM1. Transmission electron micrograph (TEM) revealed that this phage showed characteristics of a Siphoviridae and it was able to kill two local S. agalactiae isolates, which were S. agalactiae smyh01 and smyh02. Whole genome sequencing (WGS) of the phage DNA showed that it contained 42,999 base pairs with 36.80% GC content. Bioinformatics analysis predicted that this phage shared an identity with the S. agalactiae S73 chromosome as well as several other strains of S. agalactiae , presumably due to prophages carried by these hosts, and it encodes integrase, which suggests that it was a temperate phage. The endolysin of vB_Sags-UPM1 termed Lys60 showed killing activity on both S. agalactiae strains with varying efficacy. The discovery of the S. agalactiae temperate phage and its antimicrobial genes could open a new window for the development of antimicrobials to treat S. agalactiae infection.

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Comprehensive Characterization of a Streptococcus agalactiae Phage Isolated from a Tilapia Farm in Selangor, Malaysia, and Its Potential for Phage Therapy