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Avian leukosis virus subgroup J (ALV-J), first isolated in 1989, preferentially infects meat-type birds. However, layer flocks in China have experienced outbreaks of this virus since 2008. To understand the genetic diversity of ALV-J in Chinese layers, we compared and analyzed the GP85 gene sequences of 106 ALV-J isolates that were isolated between 1999 and 2010 in Mainland China. The GP85 gene sequences...
Infectious bursal disease virus (IBDV) is a birnavirus that causes immunosuppressive disease in chickens. Segment B of IBDV encodes the RNA-dependent RNA polymerase VP1, which is involved in virulence. We sequenced and analyzed segment B from seven Chinese IBDV isolates, all belonging to very virulent IBDV (vvIBDV), and clustered into Branches II and III. Phylogenetic analysis suggested that segment...
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