Undetectable = Untransmittable
U=U means Undetectable = Untransmittable which means if someone with HIV has an undetectable viral load then they cannot pass on the virus through sex. The PARTNER Study says:
"Our results provide a similar level of evidence on viral suppression and HIV transmission risk for gay men to that previously generated for heterosexual couples and suggest that the risk of HIV transmission in gay couples through condomless sex when HIV viral load is suppressed is effectively zero. Our findings support the message of the U=U (undetectable equals untransmittable) campaign and the benefits of early testing and treatment for HIV."
HIV organisations across the world have joined the U=U campaign to endorse the statement that HIV sexual transmission does not occur when viral load is undetectable on HIV medication or antiretroviral therapy (ART). While the impact of HIV medication on reducing HIV transmission has been known for a long time, it's new to say ART stops sexual transmission completely. This change is especially important given that prejudice and discrimination against HIV positive people is still widespread.
"An end to the AIDS epidemic could be in sight after a landmark study found men whose HIV infection was fully suppressed by antiretroviral drugs had no chance of infecting their partner. The success of the medicine means that if everyone with HIV were fully treated, there would be no further infections."
End to AIDS in sight as huge study finds drugs stop HIV transmission | The Guardian | 2 May | 2019
"A study of nearly 1,000 gay male couples in The Lancet found no cases of HIV transmission over eight years. This was due to treatment reducing the virus to very low levels in the body. "Undetectable equals untransmittable" should be basic HIV knowledge for everyone, experts said."
Gay HIV transmission with treatment is 'zero risk', study confirms | BBC | 3 May 2019
"Our results provide a similar level of evidence on viral suppression and HIV transmission risk for gay men to that previously generated for heterosexual couples and suggest that the risk of HIV transmission in gay couples through condomless sex when HIV viral load is suppressed is effectively zero. Our findings support the message of the U=U (undetectable equals untransmittable) campaign, and the benefits of early testing and treatment for HIV."
Risk of HIV transmission through condomless sex in serodifferent gay couples with the HIV-positive partner taking suppressive antiretroviral therapy | The PARTNER Study | The Lancet | 2 May 2019
U=U: Undetectable = Untransmittable | i-base
What does undetectable = untransmittable (U=U) mean? | namaidsmap
What is an undetectable viral load? | Avert
Can't pass it on | Terrence Higgins Trust
The PARTNER Study | Alison J. Rodger, Valentina Cambiano, Tina Bruun, et al | 12 Jun 2016
Opposites Attract Study | Bavinton et al, and the Opposites Attract Study Group
Consensus statement | Prevention Access Campaign
The evidence for U=U: why negligible risk is zero risk | i-base | 9 Aug 2017
Consensus Statement | Prevention Access Campaign | 21 Jul 2017
BHIVA endorses 'Undetectable equals Untransmittable' (U=U) consensus statement | BHIVA | 12 Jul 2017
NAM endorses Undetectable equals Untransmittable (U=U) | NAM aidsmap | 9 Feb 2017
U = U is out there | Ending HIV | 16 Dec 2019 | 1m
One of those chats | Ending HIV NZ | 31 May 2018 | 1m
Zero Risk | Dr Carl Dieffenbach | Prevention Access Campaign | 14 Nov 2016
Living With HIV: What you need to know about HIV-undetectable and viral load | GMFA | 7 Sep 2016 | 51s
Undetectable Viral Load & The Sex You Want | Gay Men's Sexual Health Alliance | 24 Jul 2017 | 2m 30s