Frozen vials labeled “Smallpox” were recently discovered by a laboratory worker at a Pennsylvania facility that conducts vaccine ... according to the Centers for Disease Control and Prevention.

The history of pandemics 03:58. Frozen vials labeled "Smallpox" that were discovered in a freezer at a vaccine research facility in Pennsylvania "contain no trace of virus known to cause smallpox ...

Forgotten smallpox vials under CDC examination 03:15. The Centers for Disease Control currently is testing decades-old vials of smallpox virus that were discovered last week in a storage ...