Immune Reconstitution Inflammatory SyndromeAIDS-Related Opportunistic InfectionsAntiretroviral Therapy, Highly ActiveMeningitis, CryptococcalAnti-Retroviral AgentsHIV InfectionsSyndromeLeukoencephalopathy, Progressive MultifocalTuberculosisCentral Nervous System Bacterial InfectionsCD4 Lymphocyte CountLymphadenitisAnti-HIV AgentsImmune System DiseasesAntitubercular AgentsTuberculosis, Central Nervous SystemJC VirusSouth AfricaCryptococcosisViral LoadHIV-1Acquired Immunodeficiency SyndromeMycobacterium tuberculosisCD4-Positive T-LymphocytesInflammationProspective StudiesCohort Studies