reciprocal cross-titrations using constant concentrations of bovine antiserum ( 1 : 100 ) to either bovine herpesvirus ( bhv ) 1 or bhv 4 ( obtained from controlled infection status ) against varying concentrations of both viral antigens in enzyme-linked immunosorbent assay ( elisa ) indicated a subtle difference between the antigenic composition of these 2 agents .
C0003342
viral antigens
C0003320
antigenic