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In some areas the Bubonic Plague killed up to 90% of the population.
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Scruvy is common in sailors.
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Exposde them to cowpox virus. He rubbed the pus of cowpox onto the arm of a gardeners 8 year old son and then exposes him to smallpox, which he does not get.
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They used Landsteiner's ABO blood typing technique.
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Scientist successfully used the revived DNA to sequence the mammot's complete genome.
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Rhazes discovered the difference between smallpox and measles.
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