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: a serious disease that causes fever and a rash and often death
Full Definition of SMALLPOX
: an acute contagious febrile disease of humans that is caused by a poxvirus (species Variola virus of the genus Orthopoxvirus), is characterized by a skin eruption with pustules, sloughing, and scar formation, and is believed to have been eradicated globally by widespread vaccination —called also variola
: an acute contagious febrile disease of humans that is caused by a poxvirus of the genus Orthopoxvirus (species Variola virus), is characterized by skin eruption with pustules, sloughing, and scar formation, and is believed to have been eradicated globally by widespread vaccination—called also variola; see variola major, variola minor
One of the world's most dreaded plagues before 1980, when it was declared eradicated. It was known in ancient China, India, and Egypt. It came to the Western Hemisphere with Europeans in the 16th century and devastated the native population, which lacked resistance. An infectious viral disease only of humans, it causes fever and then a rash of variable severity that blisters and dries up, leaving scars. It is not spread easily, but the virus can survive for long periods outside the body (e.g., in bedding). Edward Jenner developed a vaccine from cowpox. The World Health Organization's eradication project reduced smallpox deaths from two million in 1967 to zero in 1977–80. The virus now exists only in laboratories; in some countries it may be under development for purposes of biological warfare.