摘要
H9N2 virus has been widely distributed in wild birds and poultry around the world since its first emergence in the United States of America in 1966(Gu et al.2017;Carnaccini and Perez 2020).The virus appeared in chickens in China in the early 1990s,and over the last two decades has gradually become the dominant epidemic subtype(Sun and Liu 2015;Bi et al.2020).Although H9N2 virus infection alone cannot cause severe disease or death in poultry,H9N2 virus-infected birds experience a degree of egg production drop and can be easily infected by other pathogens,thus causing economic losses for poultry industry.
基金
supported by the National Key Research and Development Program of China(2021YFD1800200 and 2021YFC2301700)
the National Natural Science Foundation of China(32192451)
the Innovation Program of the Chinese Academy of Agricultural Sciences(CAASCSLPDCP-202301)
the earmarked fund for CARS41(CARS-41).
