Isolation and identification of a new strain of hirame rhabdovirus (HIRRV) from Japanese flounder Paralichthys olivaceus in China

• Published in: Virology journal Vol. 14; no. 1; p. 73
• Main Authors: Zhang, Jialin, Tang, Xiaoqian, Sheng, Xiuzhen, Xing, Jing, Zhan, Wenbin
• Format: Journal Article
• Language: English
• Published: England BioMed Central 07.04.2017; BMC
• Subjects: Animals; Aquaculture; Ascitic fluid; Cell culture; Cell lines; China; Degeneration; Deoxyribonucleic acid; Distension; DNA; Epidemiology; Fish culture; Fish Diseases - virology; Flounder; Flounder - virology; Gangrene; Gene expression; Hemorrhage; Hirame rhabdovirus; Identification; Infections; Kidneys; Microscopy; Microscopy, Electron; Next-generation sequencing; Novirhabdovirus - genetics; Novirhabdovirus - isolation & purification; Novirhabdovirus - pathogenicity; Novirhabdovirus - ultrastructure; Paralichthys olivaceus; Pathogenicity; Penicillin; Phylogenetics; Phylogeny; Polymerase chain reaction; Proteins; Reverse Transcriptase Polymerase Chain Reaction; Rhabdoviridae Infections - veterinary; Rhabdoviridae Infections - virology; RNA polymerase; RNA, Viral - genetics; Sepsis; Sequence Analysis, DNA; Shellfish; Vaccines; Virion - ultrastructure; Virulence; Viruses; Water temperature; China; Pathogenicity; Identification; Hirame rhabdovirus; Paralichthys olivaceus
• ISSN: 1743-422X; 1743-422X
• DOI: 10.1186/s12985-017-0742-4

Hirame rhabdovirus virus (HIRRV) is a rhabdovirus that causes acute hemorrhage disease in fish culture, resulting in a great economic loss in parts of Asia and Europe. In this study, we isolated a virus strain named as CNPo2015 from cultured Japanese flounder in Shandong province, China. Cell isolation, electron microscopic observation, RT-PCR detection and phylogenetic analysis were used for virus identification. Further, artificial infection experiment was conducted for virulence testing. The gross signs included abdominal distension, fin reddening and yellow ascitic fluid in the abdominal cavity. Histopathological examination revealed marked cell degeneration and necrosis in the kidney. The tissue homogenates induced obvious cytopathic effects in EPC, FHM and FG cell lines. Electron microscopic observation showed the virus had a bullet-like shape with a capsule membrane. RT-PCR and sequencing analysis revealed that CNPo2015 belonged to the HIRRV with high sequence identity to HIRRV isolates. Infection experiment confirmed that the HIRRV CNPo2015 strain was virulent to flounder juveniles with a LD value of 1.0 × 10 TCID /fish. In conclusion, we described the first isolation and characterization of a HIRRV from Japanese flounder in China. This will provide a candidate material for further research on the infection mechanism and preventive strategies of HIRRV.