signs of latent hiv infection were sought in stored serum samples collected before overt seroconversion , confirmed by enzyme-linked immunosorbent assay ( elisa ) , from 9 subjects with human-immunodeficiency-virus ( hiv ) infection , in serum from 25 seronegative sexual partners of hiv-seropositive men and from 23 other seronegative , homosexually active men .
C0019693
human-immunodeficiency-virus
C0019699
hiv-seropositive