In the history of human-viral resistance, smallpox is the only virus that has been recognized as exterminated, humans have immune antibodies, naturally there are very few smallpox viruses, only a few scientific institutions also save samples for research.

Now a U.S. vaccine agency is making small news, with media reports that a vaccine research facility in Pennsylvania has found several vials labeled "smallpox."

The matter has been confirmed by the CDC's CDC, but they said there is "no indication that anyone has been exposed to a small number of frozen vials." ”

"At a vaccine research facility in Pennsylvania, a lab worker stumbled across a frozen vial labeled 'smallpox' while cleaning the refrigerator. The Centers for Disease Control and Prevention, its management partners and law enforcement are investigating the matter, and the contents of the vial appear to be intact," the CDC added.

"Lab staff who found the vial were wearing gloves and masks. We will provide more details when available. ”

Smallpox is a highly contagious virus,Three out of every 10 infected people die, and those who survive are often disabled, blind or disfigured.

Through the unremitting efforts of mankind, smallpox was officially recognized as eradicated at the 33rd World Health Assembly on 8 May 1980.

However, smallpox virus has not been completely eliminated, the United States, Russia and Europe and other countries and regions still retain samples of smallpox virus, which is also the United States exposed smallpox virus vial accidental discovery of the news, netizens expressed concern about the cause of the matter, for fear of what happened again.