More than 30 million people are infected - there is still no vaccine and no cure. In our theme on HIV you will meet the researchers who are waging the battle that may appear hopeless, but that is not so.
In the West, drugs have transformed AIDS into a chronic condition. But in Africa millions of people still die every year. Now researchers have started to turn away from the idea of a vaccine and are looking instead for a cure.
As a young doctor, Anders Sönnerborg was confronted by early Swedish AIDS cases. Meeting the dying patients become the start of his career in HIV research.
Pop star Andreas Lundstedt was unwilling to accept that he had contracted HIV. He did not say anything to the people around him and did not bother to take his medication.