Outbreaks of smallpox due to variolation in China, 1962-1965.


In 1985, previously unknown outbreaks of smallpox were uncovered which had occurred in Shanxi Province and Nei Monggol Autonomous Region in northern China during 1962-1965, several years after smallpox transmission was thought to have been interrupted. During field investigation, the authors learned that most of the cases were known to local health… (More)


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