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  Discovered difference between smallpox and measles.
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  First documented hospital in England Canterbury
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  Hospitals were built in London
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  Ibn an-Nafis suggests that the right and left ventricles of the heart are separate
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  The hospital of Santa Maria Nuova founded in Florence, it was strictly medica
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  The plague killed 1/3 of the population
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  English barbers and surgeons united to create The United Barbers-Surgeons Company
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  Paracelsus discovered that drinking mercury was a cure for syphilis
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  Vesalius dissected human bodies
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  Dutch lens grinder Zacharius Jannssen invents microscope
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  Laennac invents stethoscope
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  First transfusion of human blood
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  First use of ether as an anesthetic.
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  First public use of anesthesia during surgery
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  First successful appendectomy performed in Iowa
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  Bernard Fantus starts the first blood bank at Cook County Hospital in Chicago
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  Surgeon Rene Favaloro performs first coronary bypass operation using patient's vein
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  First vaccine found
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  HIV is identified
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  First vaccine for lyme disease