Acquired Immune Deficiency Syndrome (AIDS) is a term that is used to describe the latter stages of HIV, when the immune system has stopped working and the person develops a life-threatening condition, such as pneumonia (infection of the lungs).
The term "AIDS" was first used by doctors when the exact nature of the HIV virus was not fully understood. However, the term is no longer widely used because it is too general to describe the many different conditions that can affect somebody with HIV. Specialists now prefer use the terms "advanced" or "late-stage" HIV infection.
