Human Immunodeficiency Virus (HIV)

HIV (human immunodeficiency virus) is the cause of AIDS (acquired immunodeficiency syndrome). HIV is a type of virus called a retrovirus, which infects humans when it comes in contact with a break in the skin or tissues such as those that line the vagina, anal area, mouth, or eyes.

Image Collection: Picture of HIV/AIDS

View a picture of the human immunodeficiency virus (HIV), the cause of AIDS (acquired immunodeficiency syndrome) in our image collection.


Test your medical IQ of HIV and AIDS. Quiz yourself on transmission methods and how HIV/AIDS affects the immune system. Also discover causes, symptoms, tests, and diagnosis of HIV infection.


AIDS is the advanced stage of HIV infection. Get information about the history of AIDS, symptoms, signs, diagnosis, statistics, treatment, prognosis, prevention, and research.

Read more about aids »

AIDS Retrospective

Watch this slideshow to get a historical overview of the HIV/AIDS pandemic from human contraction to the present.

View the slideshow on aids retrospective »

HIV Dementia

View a picture of HIV-associated dementia (HAD) and learn more about other dementia conditions.

View the image of hiv dementia »

A - Z List of HIV/AIDS Topics

Alphabetized listing of articles related to HIV/AIDS