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강원도의 연어과 어류에서 분리된 IHNV 분리주의 계통분류 및 병원성 분석
임종원 ( Jongwon Lim ),고은호 ( Eunho Go ),홍수희 ( Suhee Hong ) 한국어병학회 2021 한국어병학회지 Vol.34 No.2
This study investigated the phylogenetic classification and pathogenicity of 6 infectious hematopoietic necrosis virus (IHNV) strains isolated from salmonid fish in Gangwon-do, Korea. Based on the nucleotide sequence of mid-G region, all six strains belong to J genotype, of which 5 are J-Nagano type and 1 J-Shizuoka type. In a challenge test, 5 isolates of J-Nagano type IHNV showed a various mortalities as 2 isolates induced a high mortality of 100% and the other 3 isolates induced mortalities of 50, 30, and 20% after intraperitoneal injection in rainbow trout (Oncorhynchus mykiss). Meanwhile no mortality was occurred by 1 isolate of J-Shizuoka type virus. Thus, it seems that there might be no relation between genotype and pathogenicity within IHNV J genotypes. This is contrary to previous studies where reported a higher pathogenicity of J-Shizuoka type virus than J-Nagano type virus in rainbow trout. Further examination will be required to clarify this since only one J-Shizuoka type virus was analyzed in this study.