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1、18世纪,天花对人类威胁极大,传染上以后就整天发高烧,4个人中就会有1个死亡,3个变成麻子。对此,英国乡村医生爱德华·琴纳(1749-1823)心急如焚。
In the 18th and the 18th centuries, the smallpox was a great threat to mankind. After being infected, all the people had a high fever. One in four people died and three became pockmarks. In this regard, the English country doctor Edward Jenner (1749-1823) anxious.