On June 5, 1981, the first published report emerged of five previously healthy young gay men in Los Angeles diagnosed with what soon would be known as AIDS. One year later, the first AIDS case was reported in sub-Saharan Africa.

The lives of millions of people around the globe were changed forever. The decades that have followed were filled with devastation and despair, but also with courage, hope, and healing.

This timeline captures key snapshots along this journey, seminal milestones that shaped the epidemic, and the global response to it. Together, we have made tremendous progress, but the journey continues.