Powdered smallpox scabs were blown into the noses of the healthy, and they would then develop a mild case of the disease and from then on were immune to it.

  • 将天花痘痂粉末吹人健康者的鼻孔,使其染病但症状较轻,痊愈之后便会终身对天花具有免疫力。

  • 互联网摘选 2025-01-19 22:26:43

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