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Egyptians used bloodletting to try to cure diseases
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Greeks distinguished between arteries and veins
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Anton van Leeuwenhoek viewed blood cells under a microscope
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First blood transfusion performed
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Karl Landsteiner discovered three blood types: A, B, and O
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Alfred Decastello discovered a fourth blood type: AB
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Percy Oliver established the first blood donor service
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Mayo Clinic developed a method to store blood for transfusions
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Dr. Bernard Fantus established the first blood bank
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Karl Landsteiner discovered the Rh protein
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First case of AIDS recorded in the Congo
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Robert Gallo identified the virus causing AIDS
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Development of ELISA test to screen for diseases such as HIV
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Scientists began developing blood-screening tests for infectious diseases
