摘要
Dear Editor,The low-pathogenic avian influenza subtype of the H9N2virus circulates in domestic poultry and wild birds throughout the world,causing severe morbidity and mortality in commercial chickens during coinfection with other pathogens,resulting in enormous losses.This kind of virus has been prevalent since the H9N2 virus was first identified
Dear Editor,The low-pathogenic avian influenza subtype of the H9N2 virus circulates in domestic poultry and wild birds through- out the world, causing severe morbidity and mortality in commercial chickens during coinfection with other patho- gens, resulting in enormous losses. This kind of virus has been prevalent since the H9N2 virus was first identified in China in 1994.
