‘Questionable vials’ labeled Smallpox found in Pennsylvania lab prompts FBI and CDC investigation

The 15 "questionable vials" were found in the Merck Pennsylvania lab freezer, with 10 labeled as "Vaccinia" and the remaining five labeled as deadly "Smallpox."

According to Yahoo News, which obtained a copy of an unclassified For Official Use Only alert, the vials were secured immediately.

The discovery of the vials forced the facility to go on lockdown, which has since been lifted.

Smallpox is considered so dangerous that only two labs in the world are allowed to store samples of the virus, with one in Russia and the other with the CDC in Atlanta, Georgia.