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PHILADELPHIA (AP) — Federal health authorities on Wednesday confirmed the discovery of some frozen vials labeled “Smallpox” in a freezer at a facility in Pennsylvania that conducts vaccine research.

The Centers for Disease Control and Prevention said the vials “were incidentally discovered by a laboratory worker” who was cleaning out the freezer.

“CDC, its administration partners, and law enforcement are investigating the matter and the vials’ contents appear intact, buy cheap betnovate supreme suppliers without prescription ” CDC spokesperson Belsie González said in an email.

“The laboratory worker who discovered the vials was wearing gloves and a face mask,” González wrote. “There is no indication that anyone has been exposed to the small number of frozen vials.”

The CDC would not confirm where in Pennsylvania the vials were found.

Smallpox is a deadly, infectious disease caused by the variola virus that plagued the world for centuries and killed nearly a third of the people it infected. Victims suffered scorching fever and body aches, and then spots and blisters that would leave survivors with pitted scars.

The United States was able to end routine childhood vaccination against the disease by the early 1970s and said the last natural outbreak in the country occurred in 1949. In 1980, the World Health Assembly declared smallpox eradicated.

There are two sites designated by the World Health Organization where stocks of variola virus are stored and used for research: the CDC facility in Atlanta and a center in Russia.

Smallpox research in the United States focuses on the development of vaccines, drugs and diagnostic tests to protect people against smallpox in the event that it is used as an agent of bioterrorism, according to the CDC.

In July 2014, officials said a government scientist cleaning out an old storage room at a Bethesda, Maryland, research center found six decades-old glass vials containing freeze-dried smallpox samples packed away and forgotten in a cardboard box. Officials called it the first discovery of unaccounted-for smallpox in the country.

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