birds given injections of rav-1 failed to produce neutralizing antibody to any of the pseudotype sarcoma viruses of the various alv , whereas many birds challenged with rav-3 or rav-5 produced neutralizing antibody directed against the heterologous rav-1 as well as the homologous viruses , but not against the tolerated virus alv-f42 .
C0003241
antibody
C0475463
neutralizing antibody