sera with different content of hemagglutination-inhibiting antibody ( h.i.a . ) collected from healthy subjects in late summer 1978 , from influenza cases which occurred in winters 1977-78 and 1978-79 and from vaccinees in autumn 1978 were checked for neutralizing antibodies ( n.a . ) to a/ussr/90/77 influenza virus strain .
C0003241
antibody
C0475463
neutralizing antibodies