The primary purpose of this study is to assess the ability to swallow the scored film-coated darunavir/cobicistat/emtricitabine/tenofovir alafenamide (D/C/F/TAF) fixed-dose combination (FDC) tablet, irrespective of the mode of intake (whole and split tablet).

This study will be performed in 24 human immunodeficiency virus type 1 (HIV-1) infected pediatric participants. This study is being conducted to obtain data needed to assist in further pediatric development of D/C/F/TAF by assessing the acceptability of the scored film-coated D/C/F/TAF FDC tablet administered as a matching placebo tablet in a pediatric population. At Day 1, each participant will sequentially take 2 placebo tablets and the sequence of placebo tablet, swallowed whole or as split tablet, is assigned by computer generated randomization. After each intake period (within 15 minutes and before the next intake period, as applicable), participants will be asked to fill out an acceptability questionnaires. Every attempt should be made for the participant to complete the questionnaire (marking the correct box to correspond with their impact of taking the placebo tablet). Caregivers may explain the wording/text in the questionnaire to aid in completion. If a participant and his or her caregiver have difficulties in completing the questionnaire, then the study-site personnel may assist. Primarily ability to swallow the scored film-coated D/C/F/TAF FDC tablet, irrespective of the mode of intake will be assessed. Participants safety will be evaluated throughout the study from signing of the Informed Consent Form (ICF)/Assent Form onwards until the last study-related visit.

Inclusion Criteria:

• Have a body weight of at least 25 kilogram (kg) and less than (<) 40 kg
• Has documented chronic human immunodeficiency virus type 1 (HIV-1) infection
• Must be on a stable antiretroviral (ARV) regimen for at least 3 months prior to screening
• Has documented plasma HIV-1 ribonucleic acid (RNA) < 400 copies/milliliter (mL) within 6 months prior to screening
• Parent(s) or their legally acceptable representative must sign an informed consent form (ICF) indicating that he or she understands the purpose of, and procedures required for, the study and is willing to allow the child to participate in the study. Assent is also required of children capable of understanding the nature of the study (typically 7 years of age and older)

Exclusion Criteria:

• Any active condition (example, active oral infection [candidiasis], significant physical or psychological disease or other findings during screening) that could prevent the participant from swallowing, or limit or confound the protocol-specified assessments and outcomes or for which, in the opinion of the investigator, participation could compromise the safety or well-being of the participant
• Taking any disallowed therapies
• Is a family member of an employee or investigator of the study site with direct involvement in the proposed study or other studies under the direction of that investigator or study site, or is a family member of an employee of Johnson & Johnson
• Have any known allergies to the excipients of the placebo tablet

The data sharing policy of the Janssen Pharmaceutical Companies of Johnson & Johnson is available at www.janssen.com/clinical-trials/transparency.

As noted on this site, requests for access to the study data can be submitted through Yale open Data Access (YODA) Project site at yoda.yale.edu