HIV Vaccine in HIV-uninfected Adults

IHV01 consists of the Full-Length Single Chain (FLSC) gp120-CD4 chimera subunit HIV-1 vaccine formulated in aluminum phosphate adjuvant. It is encoded by a synthetic gene, which contains a human codon-optimized HIV (BaL) gp120 sequence followed by human CD4D1D2, with a flexible 20-amino acid linker.

A244 consists of the gp120 envelope glycoprotein HIV-1 subtype CRF\_01AE A244 derived from the CM244 CRF\_01AE. The A244 gp120 envelope has an 11 amino N-terminal deletion, similar to the A244 protein used in AIDSVAX B/E. The aluminum hydroxide fluid gel (AHFG) adjuvant that is mixed with A244 consists of Rehydragel HPA that is diluted with sterile water for injection to a concentration of 5 + /- 1mg/mL.

ALFQ (Army Liposomal Formulation) is a liposomal adjuvant containing a synthetic monophosphoryl lipid A (MPLA) with the addition of QS-21.

Normal saline (Sodium Chloride for injection USP, 0.9%) will be used as placebo.