There are two forms of smallpox: variola major, which is the more severe form, and variola minor, which is less common and generally less severe. Variola major had a mortality rate of about 30% ...

The campaign to eradicate smallpox ended in 1980 and is one of ... announced that the disease known medically as variola major had been eliminated in its last pockets of infection, India ...

Intravenous; WR: Western reserve. Prophylactic immunization using vaccinia virus facilitated the eradication of smallpox. Concerns on the possible use of variola virus as a bioweapon and an ...

Smallpox, one of the biggest killers in history, is caused by a virus called variola. Variola causes a distinctive rash and is often lethal. The name variola comes from the Latin word for “spotted” ...

Orthopoxvirus: Genus of DNA viruses that includes variola (smallpox), monkeypox, cowpox, and vaccinia. Progressive vaccinia: Progressive necrosis of the primary vaccination site with spread of ...

On May 8, 1980, forty-five years ago, the World Health Organization, a part of the United Nations, announced that officials had eradicated smallpox from the world’s population. The last case ...

Two high-security labs, one in the U.S. and one in Russia, still maintain live variola virus. Some officials—including D.A. Henderson, the researcher who led the WHO’s global smallpox eradication ...

An expert committee that advises the World Health Organization (WHO) has recommended that researchers in the United States and Russia be allowed for the first time to genetically engineer variola ...