Study of Bictegravir/Emtricitabine/Tenofovir Alafenamide Fixed Dose Combination in Adolescents and Children With Human Immunodeficiency Virus-1

Key Inclusion Criteria: Cohort 1: HIV-1 infected adolescents (12 to \< 18 years of age and screening weight ≥ 35 kg) who are virologically suppressed for ≥ 6 months prior to screening. Cohort 2: HIV-1 infected children (6 to \< 12 years of age and screening weight ≥ 25 kg) who are virologically suppressed for ≥ 6 months prior to screening. Cohort 3: HIV-1 infected children (≥ 2 years of age and screening weight of ≥ 14 to \< 25 kg) who are virologically suppressed for ≥ 6 months prior to screening. Cohort 4 Group 1: HIV-1 infected children (≥ 2 years of age and screening weight of ≥ 14 to \< 25 kg) who are virologically suppressed for ≥ 6 months prior to screening and unable to swallow tablets. * Documented plasma HIV-1 ribonucleic acid (RNA) \< 50 copies/mL on a stable regimen (or undetectable HIV-1 RNA level according to the local assay being used if the limit of detection is ≥ 50 copies/mL) for ≥ 6 months preceding the Screening visit. Unconfirmed virologic elevations of ≥ 50 copies/mL (transient detectable viremia, or "blip") prior to screening are acceptable. If the lower limit of detection of the local HIV-1 RNA assay is \< 50 copies/mL (eg, \< 20 copies/mL), the plasma HIV-1 RNA level cannot exceed 50 copies/mL on two consecutive HIV-1 RNA tests. * Stable antiretroviral regimen of 2 nucleoside reverse transcriptase inhibitors (NRTIs) in combination with a third agent for a minimum of 6 months prior to the screening visit. Individuals undergoing dose modifications t…