PMID- 37178795 OWN - NLM STAT- MEDLINE DCOM- 20230609 LR - 20230717 IS - 1872-7492 (Electronic) IS - 0168-1702 (Print) IS - 0168-1702 (Linking) VI - 332 DP - 2023 Jul 15 TI - Pathogenicity of two lineages of infectious hematopoietic necrosis virus (IHNV) to farmed rainbow trout (Oncorhynchus mykiss) in South Korea. PG - 199133 LID - S0168-1702(23)00095-3 [pii] LID - 10.1016/j.virusres.2023.199133 [doi] LID - 199133 AB - In May 2015, a high mortality event in farmed rainbow trout occurred in Jeollabuk-do province in Korea. Histopathological analysis revealed necrosis in the kidney, liver, branchial arch, and gills of moribund fish, and infectious hematopoietic necrosis virus (IHNV) was detected in the lesions by immunohistochemistry. Cytopathic effects were observed in EPC, FHM, and RTG-2 cell lines after inoculation with kidney and spleen tissues and IHNV was detected by reverse transcription polymerase chain reaction (PCR). The amplified PCR product was sequenced, and phylogenetic analysis placed IHNV in the JRt Nagano group. Both in vivo and in vitro trials were performed to compare the virulence properties between RtWanju15 isolate, which causes 100% mortality in imported fry, and a previous isolate RtWanju09 of the JRt Shizuoka group isolated from eggs of healthy broodfish. In vivo challenge with high dose on specific pathogen free (SPF) rainbow trout fry performed in Denmark with isolates RtWanju09, RtWanju15 and DF04/99 isolates showed a survival rates of 60%, 37.5% and 52.5% (average), respectively without statistical difference. The replication efficiency of the two isolates in the in vitro challenge was similar. CI - Copyright (c) 2023. Published by Elsevier B.V. FAU - Kim, Hyoung Jun AU - Kim HJ AD - WOAH Reference Laboratory for VHS, National Institute of Fisheries Science, Busan 46083, Korea. FAU - Olesen, Niels Jorgen AU - Olesen NJ AD - EU Reference Laboratory for VHS, Section for Fish and Shellfish Diseases, National Institute for Aquatic Resources, Technical University of Denmark, 2800 Kgs, Lyngby, Denmark. FAU - Dale, Ole Bendik AU - Dale OB AD - WOAH Reference Laboratory for ISA, Norwegian Veterinary Institute, Pb 64, N-1431 As. Norway. FAU - Kim, Young Chul AU - Kim YC AD - Department of Aquatic Life Medicine, Gangneung-Wonju National University, Gangneung 25457, Korea. FAU - Jung, Tae Sung AU - Jung TS AD - Laboratory of Aquatic Animal Diseases, Research Institute of Natural Science, Gyeongsang National University, Jinju 52828, Korea. FAU - Vendramin, Niccolo AU - Vendramin N AD - EU Reference Laboratory for VHS, Section for Fish and Shellfish Diseases, National Institute for Aquatic Resources, Technical University of Denmark, 2800 Kgs, Lyngby, Denmark. FAU - Kwon, Se Ryun AU - Kwon SR AD - Department of Aquatic Life Medical Sciences, Sunmoon University, Asan-si, Chungnam 31460, Korea. Electronic address: srkwon@sunmoon.ac.kr. LA - eng PT - Journal Article PT - Research Support, Non-U.S. Gov't DEP - 20230518 PL - Netherlands TA - Virus Res JT - Virus research JID - 8410979 SB - IM MH - Animals MH - *Oncorhynchus mykiss MH - *Infectious hematopoietic necrosis virus/genetics MH - Virulence MH - *Rhabdoviridae Infections/veterinary MH - Phylogeny MH - *Fish Diseases PMC - PMC10345748 OTO - NOTNLM OT - Immune-histopathological observation OT - Infectious hematopoietic necrosis virus (IHNV) OT - Mass mortality OT - Phylogenetic analysis OT - Rainbow trout OT - challenge test COIS- Declaration of Competing Interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper. EDAT- 2023/05/14 01:07 MHDA- 2023/06/09 06:42 PMCR- 2023/05/18 CRDT- 2023/05/13 19:25 PHST- 2023/01/29 00:00 [received] PHST- 2023/05/11 00:00 [revised] PHST- 2023/05/11 00:00 [accepted] PHST- 2023/06/09 06:42 [medline] PHST- 2023/05/14 01:07 [pubmed] PHST- 2023/05/13 19:25 [entrez] PHST- 2023/05/18 00:00 [pmc-release] AID - S0168-1702(23)00095-3 [pii] AID - 199133 [pii] AID - 10.1016/j.virusres.2023.199133 [doi] PST - ppublish SO - Virus Res. 2023 Jul 15;332:199133. doi: 10.1016/j.virusres.2023.199133. Epub 2023 May 18.