23 mar 1900 año - Dr. Karl Landsteiner's first report on his discovery of a process for classification of the four blood groups under the ABO blood group system (as A, B, AB and O), "Regarding on the knowledge of the antifermentative, lytic and agglutinating effects of the blood serum and the lymph" is published in the Austrian medical journal Centralblatt fur Bakteriologie, Parasitenkunde und Infektionskrankheiten

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In 1930, Landsteiner will win the Nobel Prize in Physiology or Medicine for his contribution to the discovery that made safe blood transfusions possible.

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