T-Lymphocytopenia, Idiopathic CD4-PositiveLymphopeniaLymphocyte CountLymphocytesLeukocyte CountCD4 Lymphocyte CountProtein-Losing EnteropathiesParasite LoadOpportunistic InfectionsLeukoencephalopathy, Progressive MultifocalCD4-Positive T-LymphocytesLymphocyte ActivationT-LymphocytesLymphocyte SubsetsRetrospective StudiesHIV InfectionsB-LymphocytesLymphocytosisPlatelet CountBlood Cell CountCD4-CD8 RatioAIDS-Related Opportunistic InfectionsCell CountViral LoadAcquired Immunodeficiency SyndromeFlow CytometryAnti-HIV AgentsHIV-1SpleenPhytohemagglutininsAntiretroviral Therapy, Highly ActiveCD8-Positive T-LymphocytesLymphocyte Culture Test, MixedLeukemia, Lymphocytic, Chronic, B-CellTime FactorsT-Lymphocyte SubsetsImmunity, CellularImmunophenotypingLymphocytes, Tumor-InfiltratingInterleukin-2Erythrocyte CountAntigens, CD3Leukemia, LymphoidLymphocyte DepletionAntibodies, MonoclonalT-Lymphocytes, CytotoxicCells, Cultured