AntibodiesHIV InfectionsAntibody SpecificityHIV SeropositivityAntibodies, ViralAntibodies, BacterialAntibodies, MonoclonalAntibodies, NeutralizingAntibody FormationHIV SeroprevalenceHIV SeronegativityAntibody AffinityFluorescent Antibody TechniqueAntibodies, Anti-IdiotypicBinding Sites, AntibodyHIV-1EpitopesHIV AntibodiesHIV AntigensAntibodies, ProtozoanAntibodies, NeoplasmAntibodies, AntinuclearAcquired Immunodeficiency SyndromeAIDS SerodiagnosisCross ReactionsAnti-HIV AgentsMolecular Sequence DataImmunoglobulin MNeutralization TestsHIV Protease InhibitorsAutoantibodiesSexual BehaviorAntibodies, FungalHIV Envelope Protein gp120Amino Acid SequenceHomosexuality, MaleAntigen-Antibody ReactionsCD4 Lymphocyte CountAntibodies, BispecificHIV Core Protein p24Mice, Inbred BALB CImmunoglobulin GRisk-TakingAntibodies, BlockingSingle-Chain AntibodiesAnti-Retroviral AgentsAntigen-Antibody ComplexViral LoadHIV Reverse TranscriptaseSouth AfricaImmunoglobulin Fab FragmentsAntibodies, HeterophileAntibodies, CatalyticReceptors, HIVPrevalenceCell LineImmunoglobulin ASubstance Abuse, IntravenousSexual PartnersHIV ProteaseEnzyme-Linked Immunosorbent AssayRabbitsFluorescent Antibody Technique, IndirectEpitope MappingAntibodies, Monoclonal, HumanizedHybridomasImmune SeraImmunizationImmunoenzyme TechniquesRecombinant ProteinsAntibodies, AntiphospholipidCells, CulturedHIV Envelope Protein gp41Seroepidemiologic StudiesTime FactorsHIV Long-Term SurvivorsAntigensImmunoassayT-LymphocytesAIDS-Related Opportunistic InfectionsCondomsBlotting, WesternUgandaAntigens, BacterialRisk FactorsUnsafe SexCD4-Positive T-LymphocytesAntigens, SurfacePregnancyImmunization, PassiveAntigens, ViralZimbabweCoinfectionCross-Sectional StudiesHealth Knowledge, Attitudes, PracticeBase SequenceImmunohistochemistryB-LymphocytesCounselingImmunoglobulin Fragments