This month marks 35 years since the U.S. Centers for Disease Control and Prevention first reported cases of a puzzling illness that was initially thought to primarily afflict gay men.
The disease, which would eventually become a global pandemic known as HIV/AIDS, sparked widespread misunderstanding and fear. It remains a major public health issue, with no cure.
But awareness about the disease is widespread, and effective treatment is helping those with HIV to extend their lives.
Here are some facts and figures from the United Nations Program on HIV/AIDS. All estimates are as of December 2015.
The number of people living with...