Blood Spatter Timeline By Omamulwale 2500 BCE Egyptians used bloodletting to try to cure diseases 1659 BCE Anton van Leeuwenhoek viewed blood cells under a microscope 500 BCE Greeks distinguished between arteries and veins 1795 First blood transfusion performed 1901 Karl Landsteiner discovered three blood types: A, B, O 1902 Alfred Decastello discovered fourth blood type: AB 1922 Percy Oliver established the first blood donor service 1935 Mayo Clinic developed a method to store blood transfusions 1937 Dr. Bernard Fantus established the first blood bank 1940 Karl landsteiner discovered the Rh protein 1969 First case of AIDS recorded in Congo 1984 Robert Gallo identified the virus causing AIDS 1985 Development of ELISA test to screen for disease such as HIV 1987 Scientists began developing blood screening tests for infectious diesases
