A Study Evaluating Implementation Strategies for Cabotegravir (CAB)+ Rilpivirine (RPV) Long-acting (LA) Injectables for Human Immunodeficiency Virus (HIV)-1 Treatment in European Countries

Inclusion Criteria

• Participants aged 18 years or older at the time of signing the informed consent.
• HIV-1 infected and must be suppressed on a guideline recommended active Highly active antiretroviral therapy (HAART) regimen for at least 6 months prior to screening. Any prior switch, defined as a change of a single drug or multiple drugs simultaneously, must have occurred due to tolerability/safety, access to medications, or convenience/simplification, and must not have been done for virologic failure (on treatment HIV-1 RNA more than or equal to [>=]200 c/mL).
• Documented evidence of at least two plasma HIV-1 RNA measurements =50 c/mL.
• During the previous 12 months, any confirmed HIV-1 RNA measurement >=200 c/mL.
• Women who are pregnant, breastfeeding, or plan to become pregnant or breastfeed during the study.
• Any evidence of a current Center for Disease Control and Prevention (CDC) Stage 3 disease [CDC, 2014], except cutaneous Kaposi's sarcoma not requiring systemic therapy, and historical or current Cluster of Differentiation 4 (CD4)+ counts )3.25 is exclusionary.
• Fib-4 score 1.45-3.25 requires Medical Monitor consultation Fibrosis 4 score formula:

(Age times Aspartate aminotransferase [AST]) / (Platelets times (square [Alanine aminotransferase]{ALT}).

• Unstable liver disease (as defined by any of the following: presence of ascites, encephalopathy, coagulopathy, hypoalbuminemia, esophageal or gastric varices, or persistent jaundice or cirrhosis), known biliary abnormalities (with the exception of Gilbert's syndrome or asymptomatic gallstones or otherwise stable chronic liver disease per investigator assessment).
• History of liver cirrhosis with or without hepatitis viral co-infection.
• Ongoing or clinically relevant pancreatitis.
• Clinically significant cardiovascular disease, as defined by history/evidence of congestive heart failure, symptomatic arrhythmia, angina/ischemia, coronary artery bypass grafting (CABG) surgery or percutaneous transluminal coronary angioplasty (PTCA) or any clinically significant cardiac disease.
• Ongoing malignancy other than cutaneous Kaposi's sarcoma, basal cell carcinoma, or resected, non-invasive cutaneous squamous cell carcinoma, or cervical intraepithelial neoplasia; other localized malignancies require agreement between the investigator and the Study medical monitor for inclusion of the participant prior to inclusion.
• Any condition which, in the opinion of the Investigator, may interfere with the absorption, distribution, metabolism or excretion of the study drugs or render the participant unable to receive study medication.
• History or presence of allergy or intolerance to the study drugs or their components or drugs of their class. Current or anticipated need for chronic anti-coagulation with the exception of the use of low dose acetylsalicylic acid (less than or equal to [ =5 times the upper limit of normal (ULN) or ALT >=3 times ULN and bilirubin >=1.5 times ULN (with >35 percent [%] direct bilirubin).
• Any verified Grade 4 laboratory abnormality. A single repeat test is allowed during the Screening phase to verify a result.
• Participant has estimated creatinine clearance <50 milliliters per minute (mL/min)/1.73 m^2 via the Chronic Kidney Disease Epidemiology Collaboration (CKD-EPI) equation.
• Exposure to an experimental drug or experimental vaccine within either 28 days, 5 half-lives of the test agent, or twice the duration of the biological effect of the test agent, whichever is longer, prior to Day 1 of this study.
• Treatment with any of the following agents within 28 days of Day 1:
• Radiation therapy.
• Cytotoxic chemotherapeutic agents.
• Tuberculosis therapy except for isoniazid (isonicotinylhydrazid [INH]).
• Anti-coagulation agents.
• Immunomodulators that alter immune responses such as chronic systemic corticosteroids, interleukins, or interferons.
• Treatment with an HIV-1 immunotherapeutic vaccine within 90 days of screening.
• Use of medicatio