how did Jenner discovered the smallpox m medicine
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when he was working in hi laboratory he observed the material in china dish that was killing bacteria in it,
he then used the same material and used it to make the medicine of Smallpox
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The basis for vaccination began in 1796 when the English doctor Edward Jenner noticed that milkmaids who had gotten cowpox were protected from smallpox. Jenner also knew about variolation and guessed that exposure to cowpox could be used to protect against smallpox.
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