prevalence and incidence of syphilis and its association with hiv-1 infection in a population-based study in the kagera region of tanzania.population-based prevalence and incidence studies on hiv-1 infection were started in the kagera region of tanzania in 1987. the prevalence and incidence of infection with treponema pallidum was studied to enable development of better strategies for std control. serological diagnosis of a past or treated infection with troponema pallidum was made by seropositivity only to tpha testing while active syphilis was diagnosed by seropositivity to both vdrl and tpha tests. seroconversion was measured in ...19947849121
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