“…Detection of cytomegalovirus (CMV)-specific antibodies by enzyme-linked immunosorbent assay (ELISA) and solid-phase radioimmunoassay (RIA) has been described by several authors [Knez et al, 1976;Gerna et al, 1977Gerna et al, , 1978Cappel et al, 1978;Ziegelmaier [Sarov et al, 19801 of these studies, antigens prepared from infected cell suspensions were used. Among possible pitfalls in CMV serology are false-positives due t o CMV-induced IgG-(Fc) receptors [Furukawa et al, 1975;Betts et al, 1976;Keller et al, 1976;Rahman et al, 1976;Griffiths et al, 19781, anticell antibodies [The and Langenhuysen, 1972;Anderson and Andersen, 19781 and rheumatoid factors [Gispen et al, 1975;Knez et al, 1976;Meurman et al, 1977;Cremer et al, 1978;Krishna et al, 19801, The present report describes a radioimmunoassay in which extracellular CMV harvested by ultracentrifugation was adsorbed on polystyrene beads and antibodies that reacted with the virus antigen were assayed by iodinated anti-human IgG, IgM, and IgA.…”