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Edward Jenner noticed that milkmaids who were with the cows everyday didn't seem to catch smallpox.
He thought about it and came to the conclusion that the milkmaids were catching cowpox from the cows which seemed to make them immune to smallpox.
He tested his theory on a young boy named James Phillips by giving him a small dose of cowpox. He did this by taking pus from one of the milkmaids' cowpox sores and injected it into the boy.
The young boy caught the cowpox and became ill with it. However, he soon recovered.
When he was recovered he went back to Edward Jenner and Jenner gave him a tiny dose of smallpox.
James Phillips never caught the smallpox which proved that Jenner's theory was correct. He tried his theory out on many more people.
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