Panels of monoclonal antibodies (MAbs) were generated to individual proteins of an Australian isolate of bluetongue virus (BTV) serotype 1 (VP2, VP3, VP5, VP6, NS1 and NS2). The number of individual epitopes and antigenic regions each panel defined were then determined. The simultaneous reaction of certain neutralization-resistant variants and heterologous serotyoes with several MAbs specific for such epitopes, resulted in low level virus neutralization.