World AIDS Day 2017

World AIDS Day is every year on December 1st. It’s an opportunity to remember those who lost their lives due to the epidemic; and to reflect on those who still have difficulty in accessing treatment. But it is also a recognition of the progress made in treatment. Remarkably, today, people with HIV have access to […]

U=U…More (Confirmatory!) Data

A study of 343 gay couples, where one partner had HIV and the other did not, has not found a single case of HIV transmission in 16,889 acts of condomless anal sex, the 9th International AIDS Society Conference on HIV Science (IAS 2017) in Paris, France, was told today. The Opposites Attract study looked at […]

New Information Campaigns…”Can’t Pass It On” and “U=U”

There are a couple of campaigns that are trying to reduce the stigma associated with HIV. Both have the same message, but use different slogans. THT has a campaign called “Can’t Pass it on”:,4ZU5D,GNFZ55,J0X60,1 They say: Medical evidence has shown that people on effective HIV treatment can’t pass it on. If everyone knew this, we […]

Treatment as Prevention (TasP) – Success in Denmark

A new study from Denmark provides some of the clearest evidence yet that ‘treatment as prevention’ can really make a big difference at the population level. There’s already very good evidence that individuals living with HIV can avoid transmitting the virus by taking HIV treatment. But there are questions about whether HIV treatment can really stop […]

HIV Transmission and Antiretroviral Therapy

Antiretroviral treatment (ART) greatly reduces the risk of transmitting HIV. Several very large studies have now shown that people with undetectable viral load do not pass on HIV to their sexual partners. However, there is still a possibility that HIV might be passed on during the period between starting treatment and viral load becoming detectable, which may […]

When is HIV Transmitted?

It has now been well established that for someone whose viral load has been undetectable for some months, and who is currently on antiretroviral therapy (ART), then the risk of them transmitting HIV is extremely small – scientists hate to say never, but the risk is negligible. So researchers are trying to get a better […]

Transmission risk with low viral load

The second large study to look at whether people with HIV become non-infectious if they are on antiretroviral therapy (ART) has found no cases where someone with a viral load under 200 copies/ml transmitted HIV, either by anal or vaginal sex. When asked what the study tells us about the chance of someone with an undetectable […]