title: The hemagglutinating unit of influenza virus in the hemagglutination-inhibition test.
mesh_terms: D000914:Antibodies, Viral / Q000032:analysis*; D006385:Hemagglutination Inhibition Tests; D006801:Humans; D007251:Influenza, Human / Q000175:diagnosis / Q000276:immunology*
chemical_list: D000914:Antibodies, Viral