U=U (Undetectable Equals Untransmittable, i.e. HIV Treatment as Prevention)

The Latest

The Next Frontier of U=U Science

Undetectable equals untransmittable (U=U) has improved HIV prevention and tackled stigma, but there are still a few questions to answer.

By Sony Salzman

Gay Men Cannot Get HIV From Partners Who Are Virally Suppressed, New Study Proves

Results from the PARTNER2 study, presented by Alison Rodger at AIDS 2018, yielded an equivalent level of confidence for gay men as it had for heterosexual couples in the original PARTNER study several years ago.

By Ace Robinson and Kenyon Farrow

HIV Undetectable = Untransmittable (U=U): Information for Providers

The basics for health care professionals covering the evidence for U=U, HIV prevention, and considerations for acheiving undetectable viral load.

By New York City Department of Health and Mental Hygiene

HIV Researchers Reassert Treatment Is Prevention

"We need to meet people where they are at. If you do not want to have a medical provider, but you are interested in being on [pre-exposure prophylaxis], then we should create an environment where it is possible for you to get that," says Matthew Gold...

By Barbara Jungwirth

No HIV Transmissions in Couples With Positive Partner Undetectable on Treatment

HIV-positive individuals with a viral load below 200 while on antiretroviral therapy did not transmit HIV to steady sex partners during more than one year of condomless sex.

By Mark Mascolini

Treatment as Prevention Could Nearly Eliminate HIV in MSM, Danish Study Predicts

Antiretroviral treatment as prevention (TasP) in Denmark could nearly eliminate the HIV epidemic among men who have sex with men (MSM), according to predictions of a Bayesian back-calculation model.

By Mark Mascolini

Negligible Risk: Updated Results From Two Studies Continue to Show That Antiretroviral Treatment and an Undetectable Viral Load Is a Highly Effective HIV Prevention Strategy

Interim analyses from two important studies clearly demonstrated that ART and an undetectable viral load is a highly effective HIV prevention strategy for heterosexual and gay male serodiscordant couples.

By Canadian AIDS Treatment Information Exchange

Early HIV Treatment Lowers Transmission Risk by Up to 93%: HPTN 052 Final Results

Final results of HPTN 052, the watershed randomized trial that positioned antiretroviral therapy (ART) as an HIV prevention strategy, indicate that participants starting ART at a high CD4 count sustained a 93% lower risk of transmitting HIV to sex pa...

By Mark Mascolini

Zero: No Linked HIV Transmissions in PARTNER Study After Couples Had Sex 58,000 Times Without Condoms

The PARTNER study provides the strongest estimate of actual risk of HIV transmission when an HIV positive person has undetectable viral load -- and that this risk is effectively zero.

By Simon Collins for HIV i-Base

HPTN 052: No Partner Infections With Viral Suppression

Final results revealed a 93% reduction in sexual HIV transmission within serodiscordant couples when the individual with HIV was taking antiretroviral therapy.

By Emily Newman for BETA