SurvivorsHIV Long Terminal RepeatHIV InfectionsAcquired Immunodeficiency SyndromeEpidemicsDisease OutbreaksHIV-1HIVtat Gene Products, Human Immunodeficiency VirusGene Products, tatHIV SeroprevalenceHIV SeropositivityGenes, tatHistoriographyChild, OrphanedLegislation, NursingSexual BehaviorAfrica South of the SaharaSubstance Abuse, IntravenousPrevalenceHomosexuality, MaleGene Expression Regulation, ViralIncidenceAnti-HIV AgentsProstitutionUnited NationsRisk FactorsSouth Africa