In addition, monoclonal antibodies have permitted analysis of the similarities and differences between hapadnaviruses (C8te et al., 1982) , parvoviruses (Burtonboy et al., 1982; Parrish et al., 1982) , rotaviruses Gary et al., Greenberg et al., 1983) , bunyaviruses (Gonzalez-Scarano et al., 1982) and to identify Zinga virus as Rift Valley fever (Meegan et al., 1983) .