An estimated 1.1 million Americans are living with HIV, and yet one out of five don’t know it. 2010 Student Ambassador, Malcolm Berry wrote about his experience working as a peer educator with Metro TeenAIDS, an organization dedicated to preventing HIV infection among young people in Washington, DC. Read his Reflection, Battling AIDS in My City, to learn more and visit the World AIDS Day US campaign page for resources and find activities in your community. To find out about activities taking place across the globe visit the World AIDS Campaign.