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The first vaccination was discovered by Edward Jenner in 1795. He was at a farm where he noticed that the people who lived there who had been previously infected with the less harmful cow pox were somehow immune from catching small pox. Because germs and all that hadn't been discovered properly yet (that came in 1861), Jenner wasn't sure why it worked, but he created the first vaccination for small pox that contained a form of cow pox, and it worked :D. The word vaccination comes from Jenner, who used the latin word 'vacca', meaning cow.

Hope this answered your question!He also heard a milkmaid boasting that she would't get smallpox because she had already had cowpox.

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