I watched the Kurgesagt video about smallpox and he gave a explanation by saying that the immune system took control and it eventually kills the virus,but if you can give a more in depth explanation about it becuese the virus was all over the body and it would have been very hard for the immune system to cope with it knowing that it caused so much damage
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Not all smallpox strains were as deadly as some others.
I believe the first idea of a vaccine was when they realized that people who had a mild case were then immune to the deadlier versions of smallpox.
They started intentionally infecting people with a mild version so they would be likely to survive with minimal damage and be safe from small pox.
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