The present invention relates to a Siphoviridae bacteriophage Str-INP-1 (Accession NO: KCTC 12687BP) that is isolated from the nature and can kill specifically Streptococcus iniae cells, which has a genome represented by the nucleotide sequence of SEQ. ID. NO: 1, and a method for preventing and treating the infections of Streptococcus iniae using the composition comprising said bacteriophage as an active ingredient.
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