Abstract
Bluetongue virus (BTV) infection of ruminants is endemic throughout tropical and subtropical regions of the world. However, the molecular epidemiology of BTV infection in China has not yet been reported. In this study, the S10 gene segments from 30 BTV isolates, one attenuated BTV strain, one vaccine BTV strain, and one South Africa BTV prototype strain, were sequenced. Phylogenetic analysis of the S10 genes showed that Chinese BTV isolates could be classified into two phyletic subgroups, and the clustering of Chinese BTV viruses was dependent on their geographical origin and the number of generations for which they had been propagated, rather than their host species or year of isolation.
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