For over 20 years, the WHO has reported dozens of laboratory-confirmed human infections caused by the H9N2 virus, with an increasing trend ( Gu, et al., 2017 ; Huang, et al., 2015 ; Li, et al., 2004 ; Song and Qin, 2020 ).
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Multiple pathways to evaluate the immunoprotective effect of Turkeys Herpesvirus recombinant vaccine expressing HA of H9N2.
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