The contents of the vials, the TV channel CNN notes, look intact, and the employee who found the vessels was wearing a mask and gloves.

Several test tubes, which may contain samples of the smallpox virus dangerous to humans, were found at a vaccine research center in Pennsylvania. This was reported by CNN with reference to the Federal Centers for Disease Control and Prevention (CDC) of the United States.

“Frozen test tubes labeled “Smallpox” were accidentally discovered by a laboratory employee while cleaning a freezer at an institution that researches vaccines in Pennsylvania,” the regulator’s letter says. The CDC added that “the contents of the vials appear to be intact,” and the employee who found the vessels was wearing a mask and gloves.

An investigation is currently underway with the assistance of law enforcement agencies.

Smallpox is the only infection that has been defeated on the whole planet thanks to the global vaccination program. The last case of human disease was recorded in 1977 in Somalia; officially the victory over the disease was announced in 1980. Currently, only the Russian Vector Center and the American Center for Disease Control and Prevention (Atlanta, Georgia) have the right to store the virus and investigate it.