4. HIV Group 3 4.1 HIV-1 infection 4.2 ≥18 years old, 4.3 had a CD4+ cell count >200 cells/mm3, 4.4 undetectable plasma HIV-1 RNA, 4.5 were negative for hepatitis B surface antigen (HBsAg), antibody to hepatitis B surface antigen (anti-HBs), and antibody to hepatitis B core antigen (anti-HBc), had no history of previous vaccine, 4.6 were negative for antibody to hepatitis C virus (anti-HCV), 4.7 had no active opportunistic infections (at the time of screening), 4.8 were participated in ClinicalTrials.gov; NCT1289106.and receiving four intramuscular double doses (40 μg) at months 0, 1, 2, and 6 4.9 were willing to sign an informed consent