<human>:  When was the disease called ‘Aids’ first discovered?
<bot>: Aids was first described in 1981 by a team of scientists led by Robert Gallo. They were studying the immune systems of people infected with the HIV virus. The discovery of the HIV virus was a big breakthrough in the fight against Aids, and it led to the development of anti-retroviral drugs that have helped to dramatically reduce the number of new infections.