1887

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Volume 94, Issue 9

Prevalence of red sea bream iridovirus among organs of Japanese amberjack () exposed to cultured red sea bream iridovirus Free

Abstract

Red sea bream iridovirus (RSIV) is a representative of the genus which causes severe disease to aquaculture fish, mainly in Japan and South-east Asia. However, information to assess the viral kinetics of RSIV in fish is limited since reports on experimental infection by the immersion route, which is the natural infection route, are scarce. In this study, a method to evaluate the titre of RSIV was first developed. Experimental infections were continuously performed using RSIV cell culture as the inoculum to juvenile Japanese amberjack () (initial body weight 12.2 g) by immersion at three different concentrations. In addition, to investigate the prevalence of the virus among the organs of experimentally infected fish, viral DNA was measured at selected times by the real-time PCR method following viral inoculation by immersion. The developed titration method showed a 10 increase in sensitivity compared with the conventional method. We demonstrated that grunt fin cells can be used for continuous passage of RSIV. In the experimental infection, fish which were intraperitoneally injected with the RSIV cell culture or immersed with RSIV cell culture at 10 and 10 dilutions showed cumulative mortalities of 100 %. The results of measurements of the viral DNA of several organs from infected fish strongly suggest that the spleen is the target organ of RSIV in Japanese amberjack. Since the viral genome was detected from all the tested organs of two of five surviving fish which appeared to completely recover from the disease, it is suggested that these fish may become carriers.

  • Received:
  • Accepted:
  • Published Online:
© 2013 SGM
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2013-09-01
2024-04-18
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Prevalence of red sea bream iridovirus among organs of Japanese amberjack (Seriola quinqueradiata) exposed to cultured red sea bream iridovirus
J. Gen. Virol. 94, 2094 (2013); https://doi.org/10.1099/vir.0.052902-0
/content/journal/jgv/10.1099/vir.0.052902-0
/content/journal/jgv/10.1099/vir.0.052902-0
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