Heterocyclic Compounds, Bridged-RingMicrobial Sensitivity TestsDrug Resistance, ViralSulfamethoxazoleHIV InfectionsSensitivity and SpecificityAnti-Bacterial AgentsTrimethoprimDrug Resistance, MicrobialAnti-HIV AgentsLost to Follow-UpAntitubercular AgentsCulture MediaAnti-Retroviral AgentsBacteriological TechniquesMethodsHIVHIV-1BacteriaReproducibility of ResultsNamibiaHIV ProteaseWorld Health OrganizationHIV SeropositivityHIV Reverse TranscriptaseHIV Protease InhibitorsReverse Transcriptase InhibitorsDried Blood Spot TestingViral LoadDrug Resistance, Multiple, ViralParasitic Sensitivity TestsGenotyping TechniquesMutationSentinel SurveillanceAntiretroviral Therapy, Highly ActiveCameroonCD4 Lymphocyte CountPopulation SurveillancePrevalenceDeveloping CountriesHIV SeroprevalenceGenotypeHIV SeronegativityMedication AdherenceAsia, SoutheasternTreatment Failure