a preparation of isolated subunits of influenza a ( h1n1 ) virus hemagglutinin was examined for antigenic properties by four serological tests : radioimmunoassay , radial immunodiffusion test , complement fixation test , and hemagglutination inhibition test with hyperimmune polyclonal serum to intact virion as well as with monospecific antibodies to individual antigenic determinants obtained by adsorption technique .
C0003320
antigenic
C0003316
antigenic determinants