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16th century China, first variolation
Nasal insufflation
https://school.eb.com/levels/middle/article/variolation/74854 -
1721, variolation popularized in England
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1800th century, scarification
new variolation technique
https://school.eb.com/levels/middle/article/variolation/74854 -
1967, WHO global vaccination program
The Who tries to stop smallpox
https://school.eb.com/levels/middle/article/smallpox-vaccine/634536 -
1980, Smallpox eradication
Smallpox was eradicated using vaccine
https://school.eb.com/levels/middle/article/smallpox-vaccine/634536