What Do You Know About HIV/AIDS?

According to the CDC, more than 1.1 million Americans are infected with HIV, the virus that causes AIDS. One in 8 of these people doesn't know he or she is infected. Find out more about HIV and AIDS by taking this quiz, based on information from the CDC.

1. When was HIV first recognized in the U.S.?
2. Which of these is a symptom of HIV infection?
3. A person has AIDS when which of these occurs?
4. What does HIV-positive mean?
5. HIV attacks a certain kind of cell in the immune system. Which is it?
6. What is the CD4 T-cell count at which AIDS is considered to have developed?
7. The risk for HIV/AIDS is tied to behaviors. Which of these behaviors can put you at risk?
8. Why is a combination of medicines—called a cocktail—used to treat HIV?
9. What is the best way to protect yourself against HIV?