Several vials labeled “smallpox” have been found at a vaccine research facility in Pennsylvania, the US Centers for Disease Control and Prevention said Tuesday. “There is no indication that anyone has been exposed to the small number of frozen vials,” the CDC said in a statement emailed to CNN. “The frozen vials labeled ‘Smallpox’ were incidentally discovered by a laboratory worker while cleaning out a freezer in a facility that conducts vaccine research in Pennsylvania. CDC, its Administration partners, and law enforcement are investigating the matter and the vials’ contents appear intact,” the CDC added. “The laboratory worker who discovered...