11/08/2021
'Undetectable = Untransmittable' (U=U) is a campaign explaining how the s*xual transmission of HIV can be stopped.
When a person is living with HIV and is on effective treatment, it lowers the level of HIV (the viral load) in the blood. When the levels are extremely low it is referred to as an undetectable viral load. This is also medically known as virally suppressed. At this stage, HIV cannot be passed on s*xually.
This scientific evidence was gathered from several studies. The studies included thousands of heteros*xual and gay couples in which one partner had HIV and the other did not. Over the course of the studies, they found that there was not a single HIV transmission from an HIV-positive partner who had an undetectable viral load.
When a person is undetectable, condoms are not required to prevent HIV transmission, but being undetectable does not protect against other s*xually transmitted infections.
U=U applies to transmission through s*x only.
As well as U=U, PrEP is another way to prevent HIV transmission, for HIV-negative people who may not know the HIV status of their s*xual partner(s) or whose s*xual partner(s) is not undetectable.