AIDS / HIV Transmission Directory

HIV is transmitted when an infected person's bodily fluids enter another person's body. This usually happens through sex or drug use. It can also be passed from an infected mother to her baby during birth. Blood transfusions have an extremely small risk of transmitting HIV and are considered safe. HIV damages the immune system and hinders the body's ability to fight infections. HIV becomes AIDS when a person's CD4 T-cell count is below 200, but many people can live long lives with HIV. Follow the links below to find WebMD's comprehensive coverage about how HIV and AIDS are transmitted, how to prevent transmission, and much more.

Medical Reference

View All



Slideshows & Images

News Archive

View All