Using a scab from a healed Smallpox-sore to create a powder, Thackery then exposes the villagers to
Using a scab from a healed Smallpox-sore to create a powder, Thackery then exposes the villagers to the virus by blowing the powder into their noses. It’s a rudimentary form of vaccination known as variolation, which exposes the individual to a virus so that they come down with a mild case of Smallpox in order to develop immunity. -- source link
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