HIV is a virus that, in its advanced stages of infection, can cause AIDS. AIDS is a disease that kills by making a person unable to fight off some diseases. There is no cure for HIV infection or for AIDS. But treatment can control HIV/AIDS. And it can prevent dangerous infections. It can also reduce your risk of spreading the infection to others. HIV/AIDS can affect anyone. This includes gay, straight, or bisexual people. It can affect anyone of any gender, race, or ethnic background. HIV is passed from person to person. It's passed through close contact with blood, semen, and vaginal fluid. HIV can also be passed from a pregnant mother to her unborn child or baby during vaginal birth.