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AIzaSyCYaC8UkdPkQKLFUmpasLV5eC3M802CrcA
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oct 13, 1879 - Variolation

Description:

Purposely infect an individual with smallpox to create immunity. 1-3% chance of working

Added to timeline:

3 months ago
1
0
148
The History of Infectious Diseases

Date:

oct 13, 1879
Now
~ 139 years ago
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