The main purpose of this study is to look at whether experimental study drugs are safe, whether your body can handle the effects, and whether these study drugs improve the body's response to human immunodeficiency virus (HIV) in people with HIV (PWH) who started antiretroviral therapy (ART) early after getting HIV-1. The study treatments include: a treatment vaccine (not a preventative vaccine), a drug called vesatolimod (VES), and two broadly neutralizing antibodies (bNAbs; antibodies are natural proteins that the body makes in response to an infection), called GS-5423 and GS-2872. None of...