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H9N2 avian influenza viruses are enzootic around the world and can infect many different avian and mammalian hosts, including humans. Unlike the H9N2 viruses, which mainly originated in other countries and possess a non-structural protein 1 (NS1) of 230 aa, 98 % of the H9N2 viruses isolated in China lack the 13 aa at the C terminus of NS1 (217 aa in total).(More)
Outbreaks of pandemic H1N1 2009 (pH1N1) in turkeys have been reported in several countries. Co-infection of pH1N1 and avian H9N2 influenza viruses in turkeys provide the opportunity for their reassortment, and novel reassortant viruses might further be transmitted to other avian species. However, virulence and transmission of those reassortant viruses in(More)
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