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Sir Humphry Davy announces the anesthetic properties of nitrous oxide, although dentists do not begin using the gas as an anesthetic for almost 45 years.
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American surgeon Crawford W. Long uses ether as a general anesthetic during surgery but does not publish his results. Credit goes to dentist William Morton.
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Dr. Horace Wells, American dentist, uses nitrous oxide as an anesthetic.
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Boston dentist Dr. William Morton demonstrates ether's anesthetic properties during a tooth extraction.
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Louis Pasteur and Robert Koch establish the germ theory of disease. According to germ theory, a specific disease is caused by a specific organism. Before this discovery, most doctors believe diseases are caused by spontaneous generation. In fact, doctors would perform autopsies on people who died of infectious diseases and then care for living patients without washing their hands, not realizing that they were therefore transmitting the disease.
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First vaccine for cholera.
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First vaccine for anthrax
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First vaccine for rabies.
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Emil von Behring discovers antitoxins and uses them to develop tetanus and diphtheria vaccines.
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first vaccine for Typhoid Fever
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First vaccine for plague.
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Felix Hoffman developes aspirin.
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Sir Frederick Gowland Hopkins suggests the existence of vitamins and concludes they are essential to health. Receives the 1929 Nobel Prize for Physiology or Medicine.
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Edward Mellanby discovers vitamin D and shows that its absence causes rickets.
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insulin first used for diabetes, vaccines for diphtheria,pertussis, tuberculosis, tetanus, typhus, influenza and yellow fever. penecillin was also discovered.
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