However, in one of its first important findings, tree-building soon revealed two different types of HIV, now regarded as separate species. The first (particularly infective and virulent) type ...

HIV is a lifelong infection that affects many people. People with HIV take many different types of medicines to help control their condition and to prevent the infection from developing into AIDS.

Left: Structure of the Human Immunodeficiency Virus (HIV). Note the envelope protein that protects the virus against immunological detection and the small genome consisting of two short strands of RNA ...