To determine whether the H9N2 virus is capable of modulating FcRY expression in HD11 cells, an infectious H9N2 virus or UV-inactivated virus was adsorbed onto HD11 cells at different MOIs, and FcRY mRNA levels were measured post-infection by quantitative reverse transcription polymerase chain reaction (RT-qPCR). The gene discussed is FCRLB; the disease is infection.