To prepare monoclonal antibodies(McAbs)against HA protein of Clade 2.3.2 H5 subtype avian influenza virus(AIV),six to eight-week old female BALB/c mice were immunized with the inactivated AIV A/duck/Guangdong/S1322/2010(DK/GD/S1322/2010),which was purified by ultracentrifugation.Mouse splenic cells were fused with SP2/0cells.By means of HI and ELISA tests,we got two hybridoma cell strains,then designated as A4 and D11,respectively.The heavy chain of the 2McAbs belongs to IgG1 subclass,and the light chain be...