Health Topics A-to-Z

HIV/AIDS

What Is It? The human immunodeficiency virus (HIV) weakens the body's immune defenses by destroying CD4 (T-cell) lymphocytes, a type of white blood cell. T-cells normally help guard the body against attacks by bacteria, viruses and other germs. When HIV destroys CD4 cells, the body becomes vulnerable to many different types of infections. These infections are called “opportunistic” because usually they only have the opportunity to invade the body when the immune…

To continue reading this article you must be registered.

Get Licensed Content to Harvard Health

If you are interested in licensing content from Harvard Health Publications, please contact us using our online form. Our licensing and business development professionals will help you leverage consumer health content from Harvard Medical School as a clear differentiator in helping achieve your business goals.

Contact Us

Customer Log In

Forgot your password? Click Here.