Peptide HydrolasesSubstrate SpecificityHIV InfectionsHIV SeropositivityProtease InhibitorsHIV ProteaseHIV SeroprevalenceHIV SeronegativitySerine EndopeptidasesHIV-1EndopeptidasesCysteine ProteasesProtease LaAnti-HIV AgentsATP-Dependent ProteasesAIDS SerodiagnosisHIV AntigensAcquired Immunodeficiency SyndromeMolecular Sequence DataAmino Acid SequenceCysteine EndopeptidasesHIV Protease InhibitorsProtease NexinsSexual BehaviorSerine Proteinase InhibitorsCD4 Lymphocyte CountHomosexuality, MaleHIV Reverse TranscriptaseRisk-TakingAnti-Retroviral AgentsHIV Core Protein p24Viral LoadSouth AfricaHIV Envelope Protein gp120Receptors, HIVSexual PartnersSubstance Abuse, IntravenousPrevalenceDrug Resistance, ViralHIV Long-Term SurvivorsCondomsAIDS-Related Opportunistic InfectionsCathepsinsUnsafe SexUgandaZimbabweCysteine Proteinase InhibitorsBase SequenceHealth Knowledge, Attitudes, PracticeCoinfectionUbiquitin-Specific ProteasesCounselingVirus ReplicationRNA, ViralRecombinant ProteinsRisk FactorsEndopeptidase ClpSubtilisinsIndinavirSaquinavirCross-Sectional StudiesHIV EnteropathyMutationCell LineHIV Envelope Protein gp41ProstitutionCalpainMetalloendopeptidasesAspartic Acid EndopeptidasesVoluntary ProgramsKineticsChymotrypsinHIV-2PepstatinsBinding SitesTrypsinNelfinavirOligopeptidesAIDS Dementia ComplexSafe SexAfrica South of the SaharaModels, MolecularHydrolysisMalawiCD4-Positive T-LymphocytesProtein Processing, Post-TranslationalHIV Integrase InhibitorsEpidemicsZambiaHeterosexualitySequence Homology, Amino AcidCloning, MolecularHIV Fusion InhibitorsProteolysisReverse Transcriptase InhibitorsSerpinsCircumcision, MaleElectrophoresis, Polyacrylamide GelMolecular WeightTime Factors