Distinct Taura syndrome virus (TSV) isolates were found in (isolate Tw2KMeTSV), (isolate Tw2KPmTSV) and (isolate Tw02LvTSV). Nucleotide sequence analysis of these three isolates revealed differences in the TSV structural protein (capsid protein precursor) gene . TSV ORF2 amino acid sequence comparison and phylogenetic analysis suggested a comparatively close relationship between these three Taiwanese isolates and the Hawaiian isolate HI94TSV. In specimens that were naturally and experimentally infected with the Tw2KPmTSV isolate, the virus was contained and shrimps showed no clinical signs of infection. However, when was challenged with the Tw2KMeTSV isolate, the virus replicated freely. The ORF2 amino acid sequence of the Tw2KMeTSV isolate differed from that of isolate Tw2KPmTSV in four positions and these differences may account for their phenotypic differences, at least in terms of their ability to replicate in specific hosts.


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vol. , part 10, pp. 2963 – 2968

Abbreviations and descriptions of TSV isolates used in this study [PDF](148 KB)


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