Birnaviruses of potential new serogroups isolated from tropical fish
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Over the last 10 years, viruses have been isolated from fish imported into Singapore and also from indigenous fish in Singapore. In 1993, the marble goby Oxyeleotris marmorata** underwent viral diagnostic investigation as there were frequent reports of high losses in that species after importation into Singapore. Viruses, identified as birnaviruses based on their size and a double-stranded RNA genome, were isolated in BF-2 cells from marble gobies which were imported from four other Asian countries. The viruses underwent serotyping using antisera against all nine serotypes in birnavirus Serogroup A and the single serotype in Serogroup B. The viruses did not cross react at all with any of the antisera. However, they were neutralised with an antiserum against a birnavirus isolated in 1991 from a single giant snakehead, Channa (=Ophicephalus) micropeltes, held in a Singapore farm. That birnavirus was also not neutralised by any birnavirus Serogroup A or B antisera, and Serogroup A or B viruses were not neutralised by the antiserum against the virus isolated from C. micropeltes. On that basis the marble goby and snakehead birnaviruses should be classified as members of a new birnavirus Serogroup.
Chew-Lim, M., Ngoh, G.-H., Chong, S. Y., Chang, S. F., Kueh, S. L. F., Way, K., & Dixon, P. F. (2002). Birnaviruses of potential new serogroups isolated from tropical fish. In C. R. Lavilla-Pitogo & E. R. Cruz-Lacierda (Eds.), Diseases in Asian aquaculture IV: Proceedings of the Fourth Symposium on Diseases in Asian Aquaculture, 22-26 November 1999, Cebu City, Philippines (pp. 219-233). Fish Health Section, Asian Fisheries Society.
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