From the outside, the CDC campus in Atlanta looks fairly nondescript. But inside one of its buildings — a "box within a box" — scientists study some of the most dangerous threats to humanity.
Every year, 50,000 American adults are killed by diseases that have vaccines.
These accidents at the Centers for Disease Control and Prevention could have, in theory, killed members of its staff and the public.
In what seems like a miracle, scientists have managed to cure a baby of HIV. Here are some other diseases that once seemed too big to touch.
...with smallpox blankets.