The Centers for Disease Control and Prevention (CDC) estimates that more than 1.2 million people have HIV in the United States. About 20 percent (1 in 5) don't even know they're infected, because symptoms may not show up for many years.
Because HIV and other STDs can be spread by people who don't know they're infected, they can affect anyone. So it pays to play it safe through prevention and testing. Once you know your status, you can make the best choices for your health — and the health of your partner.
Reviewed by: Michael A. Horberg, MD, November 2015