The invention provides a novel determining method of the content of
antigen virus of an
inactivated vaccine of a recombinant
bird flu H5N1 cellgen. The method comprises the following steps of: (1) preparation of MDCK (madin darby
canine kidney), wherein 1.5ml of MDCK frozen
cell with density of 2.0*10<6> is extracted and put in a water bath at a temperature of 37 DEG C, 10 to 15ml of
cell culturefluid is added to culture for 72 hours, the
cell is digested with 0.25 percent EDTA (
ethylene diamine tetraacetic acid)-pancreatin, the cell
nutrient fluid is diluted into
MDCK cell suspension of 4.0*10<5>, the
MDCK cell suspension is spread to a 96-mesh
cell plate in a
cell density of 40,000 per pore (0.1ml per pore), the
cell plate is put in a CO2 culture case at a temperature of 37 DEG C and
humidity of 5 percent to culture for 24 hours to form a compact
monolayer for later use; and (2)
inoculation of a recombinant
bird flu H5N1
antigen, wherein recombinant
bird flu H5N1 cellgen antigens in different batches are extracted and respectively added into the compact
monolayer with 100mu l in each pore, and 100mu l of
cell maintenance fluid is added to culture for four days, and a TCID50 (50%
tissue culture infection
dose) value is calculated by the number of cytopathic pores in a Reed-Muench method. The method is applicable to a cellgen vaccine for detecting the
virus content by an erythrocyte
agglutination test, which means that different viruses use corresponding sensitive cells.