In 1983, the AIDS virus, HIV, was isolated by virologists at the Institut Pasteur. This new virus, which was completely unknown at the time, was a source of fear and rejection for infected people. And while there have been advances in scientific knowledge over the decades – for example, we now know that if a virus cannot be detected in the blood, it cannot be transmitted –, there are still many misconceptions about HIV, especially among young people, as Jennifer Pasquier, Scientific Director at French HIV/AIDS charity Sidaction explains.