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Smallpox was an infectious disease caused by variola virus (often called smallpox virus), which belongs to the genus Orthopoxvirus. [7] [11] The last naturally occurring case was diagnosed in October 1977, and the World Health Organization (WHO) certified the global eradication of the disease in 1980, [10] making smallpox the only human disease to have been eradicated to date.
The smallpox vaccine is used to prevent smallpox infection caused by the variola virus. [10] It is the first vaccine to have been developed against a contagious disease. In 1796, British physician Edward Jenner demonstrated that an infection with the relatively mild cowpox virus conferred immunity against the deadly smallpox virus.
Most people became infected during their lifetimes, and about 30% of people infected with smallpox died from the disease, presenting a severe selection pressure on the resistant survivors. [ 29 ] In northern Japan, Ainu population decreased drastically in the 19th century, due in large part to infectious diseases like smallpox brought by ...
Smallpox is more dangerous than variolation and cowpox less dangerous than variolation. Hypothesis: If target is infected with cowpox, then target is immune to smallpox. Test: If variolation after infection with cowpox fails to produce a smallpox infection, immunity to smallpox has been achieved. Consequence:
A child with smallpox.In 1980, the World Health Organization announced the global eradication of smallpox. It is the only human disease to be eradicated worldwide. Video recording of a set of presentations given in 2010 about humanity's efforts towards malaria eradication
The FDA approved a drug that could be used to treat smallpox, a disease that was officially eradicated in 1980 -- but that doesn't mean it's gone for good.
A 2 + 1 ⁄ 2-year-old boy admitted to Willard Parker Hospital for treatment of whooping cough just prior to Le Bar's death also came down with smallpox and was diagnosed on March 17. In addition, Carmen Acosta—Ishmael Acosta's wife—was admitted to Willard Parker Hospital on April 6 with a rash and fever, and was diagnosed with smallpox a ...
Unlike some viruses, humans are the only carriers of variola major. This limits the chances of the virus being unknowingly spread through contact with insect or other animal populations. Persons infected with smallpox are infectious to others for about 24 days after their infection time.