Abstract
Bluetongue, a transboundary disease, is endemic in several tropical countries and is caused by bluetongue virus (BTV). The origin and movement of BTV can be predicted by comparing nucleotide sequences of its segmented RNA genome. Such analyses have been useful in evaluating the source of the virus responsible for recent incursion of BTV into previously unreported areas. Besides several serotypes, genetically related BTV strains circulate in each endemic area, but such clusters of strains have been reported to be distinct from one geographical region to another. We obtained partial or complete sequences of the open reading frames encoded by VP2, VP6, VP7, NS1 and NS2 genes of a BTV-10 isolate of India and compared them with other BTV-10 sequences available in public database. Sequences of all the five genes showed >99% identity to BTV-10 prototype, vaccine strain and vaccine-like virus isolates from the USA. Our results suggest that Indian BTV-10 virus analysed in this study possibly originated from the United States.
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