An experimental antibody prevented the virus from returning in some infant monkeys after treatment stopped, offering a potential new direction in the search for an HIV cure.
Scientists have made a promising discovery in the search for an HIV cure. A single dose of an experimental antibody helped keep an HIV-like virus undetectable for four years in one monkey, even after antiviral medication stopped.
The findings, published in Nature Microbiology, suggest researchers may be able to target the cells where the virus hides rather than simply preventing it from multiplying.
HIV treatment has advanced significantly, allowing people to maintain undetectable viral levels and live long, healthy lives. But the virus can remain hidden inside immune cells, creating a reservoir that allows it to return when treatment stops.
What Makes This Different?
Researchers at the University of California, Davis studied 20 infant monkeys infected with simian immunodeficiency virus (SIV), a close relative of HIV. The animals received antiviral medication shortly after infection, while some also received an experimental antibody targeting cells carrying a protein called CCR5.
The results were striking:
- Four of seven monkeys receiving the CCR5-targeting antibody remained in remission for more than three months after antiviral treatment ended.
- One monkey remained without detectable virus in its blood for more than four years.
- Every monkey receiving antiviral medication alone experienced viral rebound within a week of stopping treatment.
The antibody works by directing immune cells to attack CCR5-expressing cells, including those that may harbor hidden virus. Additional testing found little evidence of remaining virus in animals with sustained remission.
Still, the experiment involved a small number of infant monkeys treated soon after infection. Researchers have not established whether the approach would work in humans, particularly adults living with longstanding HIV.
The Bigger Picture
Recent advances, including long-acting injectable HIV treatments, are making viral suppression easier to maintain. This research addresses a different challenge: whether scientists can eliminate enough hidden virus to make ongoing treatment unnecessary. It’s an encouraging step, but not yet an HIV cure.
Sources: Nature Microbiology, October 19, 2026 | ScienceAlert, October 27, 2026