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Researchers isolated an antibody from a person infected with HIV that can block the virus from infecting other cells.

Shortly after HIV was identified in 1984 as the cause of AIDS, scientists started working on a vaccine to protect people against the infection.

But HIV is a complex and changeable virus, making a safe and effective vaccine elusive.

Still, the attempt continues.

The latest discovery on this front comes from a team led by ...

CEBU CITY, PHILIPPINES—The dealer’s hands move quickly as he dispenses small vials from the waistband of his shorts, his front pockets bulging from the weight of coins and small bills. From his back pocket, he hands out syringes or collects them. Occasionally, he uses the t-shirt slung over his shoulder to wipe away the beads of sweat that made his goatee glisten.

The shanty where he works—a small room full to bursting with people—is home to one of Cebu’s many “shooting galleries,” ...