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Egyptian bloodletting was used to try and 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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The first blood transfusion was performed
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Karl Landsteiner discovered three blood types: A, B, and O.
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He discovered the fourth blood type: AB
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He established the first blood donor service.
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Mayo Clinic developed a method to store blood for transfusions.
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He established the first blood bank
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He discovered the Rh protein
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First case of AIDS recorded in the Congo.
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He 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.
