CD4 and HIV infectious disease: Included: 1. Male or non-pregnant female ≥18 years old; 2. HIV infection documented by two serologic tests; 3. Eligible to start ART (CD4 ≤ 200 cells/μL or WHO Clinical Stage IV disease); 4. Living in the study site catchment area at a stable address; 5. Willing to disclose HIV status to a treatment supporter; 6. Signed informed consent. Excluded: 1. Patients with prior ART use; 2. Life expectancy <6 months; 3. Karnofsky Performance Score <60; 4. Serious liver disease; or 5. History of single dose nevirapine for prevention of mother to child transmission of HIV infection.