Smallpox spread into China at the end of the Han Dynasty. Therapeutic remedies were first recorded in Ge Hong's Zhou Hou Jiu Zu Fang in the Jin Dynasty. It is possible that variolation made its first appearance in the Northern Song Dynasty. It can be sure that there was a variolation centre in Taiping County of Ningguo District in Anhui. The Kangxi Emperor… (More)
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