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We have characterized the immunoreactivity to human T-cell lymphotropic virus type I (HTLV-I) among 26,983 persons of various seroprevalence groups by using enzyme immunoassay, immunoblot (IB), and radioimmunoprecipitation assays (RIPA) in accordance with Public Health Service recommended guidelines for the interpretation of serologic test results for HTLV-I infection. IB-indeterminate serum specimens (n = 178) were reactive to HTLV-I gag proteins, and no serum contained only env reactivity. Overall, RIPA resolved 40% of IB-indeterminate serum samples; however, the probability that RIPA would confirm IB-indeterminate samples depended on the seroprevalence of the population tested. HTLV-I gag p19-only reactivity on IB was not a reliable marker of HTLV-I infection, while gag p24 reactivity on IB was clearly associated with positive seroreactive specimens. IB and RIPA tests did not clearly distinguish between HTLV-I and HTLV-II seroreactivities. These data emphasize that patterns of immunoreactivity to HTLV-I antigens are dependent upon the seroprevalence of the risk groups tested. In addition, RIPA detected antibodies to env proteins present in low titer in a substantial number of IB gag-only reactive sera and resolved the HTLV-I antibody status of these sera.

Characterization of antibody reactivity to human T-cell lymphotropic virus types I and II using immunoblot and radioimmunoprecipitation assays