Avian influenza has caused enormous economic losses to poultry industry. To develop kits for rapid diagnosis of avian influenza virus (AIV) H9 subtype, 8-week-old Balb/c mice were administered with pcDNA3.1 (+) carrying hemagglutinin (HA) gene of AIV H9 subtype. After cell fusion, one positive hybridoma cell strain was screened out by hemagglutination inhibition assay (HI), and another positive hybridoma cell strain was screened out by ELISA. After subcloning 3 times, the two cell strains could still secret antibodies against the HA of AIV H9 subtype. The monoclonal antibodies did not react with Newcastle disease virus, AIV H5 subtype and duck adenovirus A. Their subtypes were IgG2b with kappa light chain. These two hybridoma cell strains may play an important role in rapid diagnosis and early-warning surveillance of AIV H9 subtype.
