Avianinfluenza virus (AIV) is one of the influenza A viruses and is classified bythe World Organisation for Animal Health (OIE) as a category A virulentinfectious disease. It can be divided into 16 H subtypes (H1 to H16) and 9 Nsubtypes (N1 to N9) depending on the antigenicity of its outer membranehaemagglutinin (H)/ and neuraminidase (N) proteins. Among the avian influenzaviruses, H5N1, H7N7 and H9N2 can be transmitted to humans, with H5N1 beinghighly pathogenic and having a high mortality rate. Avian influenza has causedserious stagnation in the sale of poultry products and heavy losses to farmers,causing great economic losses to the poultry farming industry。