A study of a smallpox vaccine that could prove vital in the United States' war on bioterrorism is under way at Stanford Medical Center. The trial tests the potency of the Dryvax vaccine, a 1970s ...

In a new statement, the Centers for Disease Control and Prevention said the vials found in a Pennsylvania lab contained vaccinia, the virus used in the smallpox vaccine.

TITLE CARD GRAPHIC: Variola slide under microscope TEXT: Variola virus causes smallpox. Errol Morris (VO) So, in order to generate the vaccine, you don’t need smallpox?

The newly discovered virus belongs to a class of giants discovered just a decade ago. Because of its size (1.5 microns in length), it can be seen under a microscope, unlike other types of viruses.

Using the live samples of the virus, researchers have delved into its evolutionary genetics and learned that smallpox is between 8,000 and tens of thousands years old.

Ever since then, scientists and health experts have been debating whether to destroy the last remaining lab samples of the smallpox virus — and eliminate the (small) risk of the virus ever escaping.

Vials found at a vaccine research facility in Pennsylvania that were marked “smallpox” contained virus used to make the vaccine and not the virus that causes the disease, the US CDC reported ...

WHAT IS MONKEYPOX? The virus originates in wild animals like rodents and primates and occasionally jumps to people. It belongs to the same virus family as smallpox.

As Mpox becomes a global health emergency, experts are now looking at the smallpox vaccine to control its spread. But can it offer cross-protection?

Because the monkeypox virus is closely related to the smallpox virus, the smallpox vaccine can protect against monkeypox, according to the CDC.

There was no smallpox virus in frozen vials recently discovered at a vaccine research facility in Pennsylvania, the U.S. Centers for Disease Control and Prevention said Thursday.

Vials labeled “smallpox” that were found at a Montgomery County lab did not contain the virus known to cause smallpox but instead contained the virus used in the smallpox vaccine, the CDC ...