An increasing trend of annual isolation rate was observed in poultry markets from 2013 to 2015 and reduced from 2015 to 2018.
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Molecular and Antigenic Characterization of Avian H9N2 Viruses in Southern China.
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An increasing trend of annual isolation rate was observed in poultry markets from 2013 to 2015 and reduced from 2015 to 2018.