Go ahead and explain the methods and how they tested that this still works: Because people didn't get infected with smallpox, even though it affected very few, and they tested this by claiming that it was cowpox that stopped the infection: without any way to prove it works, there is no way to prove that cowpox will stop smallpox because there are still people that get affected with smallpox after they have had been infected with cowpox, so exactly by what mechanism can you prove that cowpox is what provided immunity and not the body itself IN SPITE of cowpox.
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