Supplementary Study of First Introduction of Western Smallpox Vaccination into China

According to A Marvelous Book of Smallpox Vaccination by Zheng Chongqian in Qing Dynasty in British Museum in London, this paper revises some previous views about the introduction of western smallpox vaccination into China, such as the specific introduction time, introduction form, initial transmission, etc., and appends the text of A Marvelous Book of Smallpox Vaccination.