HIV, which stands for human immunodeficiency virus, is a virus that attacks cells that help the body fight infection. If left untreated, it can lead to AIDS, or acquired immunodeficiency syndrome.

The human immunodeficiency virus (HIV) is a virus that attacks the body's immune system. If not treated, it can lead to the autoimmune deficiency syndrome (AIDS). As happens with other viruses ...

HIV and AIDS are related, in that AIDS is the most advanced stage of an HIV infection, and therefore, the HIV virus causes both conditions. AIDS can also be called a "stage 3 HIV infection." ...

Human immunodeficiency virus (HIV) weakens your body's immune system by attacking your white blood cells. Find out more about causes and treatment.