| hiv, hbv, delta-agent and treponema pallidum infections in two rural african areas. | in order to compare the seroepidemiology of human immunodeficiency virus (hiv), hepatitis b virus, delta agent and treponema pallidum infections in two rural populations living in north uganda (kitgum district) and in central burundi (butezi, ruyigi region), 448 sera were tested for hbs-ag, hbs-ab, and anti-hiv antibodies and screened for syphilis using the t. pallidum haemagglutination (tpha) test. hbs-ag positive sera were also tested for anti-delta antibodies. overall seropositivity rates in ... | 1990 | 2189236 |