Smallpox inoculation

Smallpox was highly contagious and deadly, and left survivors disfigured with pockmarks. But the disease didn't recur in the same person. In Turkey, some began deliberately spreading mild cases of the disease through pus, but this was fraught.
 Mary Wortley Montagu England 1713 Smallpox inoculation

Smallpox was highly contagious and deadly, and left survivors disfigured with pockmarks. But the disease didn't recur in the same person. In Turkey, some began deliberately spreading mild cases of the disease through pus, but this was fraught.