In 1875 different blood types were recognized. In 1901 Karl Landsteiner named and standardized the groups. Red blood cells carry a substance called an antigen which produce antibodies to fight infections. Karl noticed this and decide to test it. He found two distinct reactions(clumping and repelling). He labeled these type A (in which antigen A was present, anti B antibody was present, but antigen B was absent), and Type B (in which antigen A was absent and antigen B was present). A third reaction was formed, C later relabeled as O, in which neither antigen A or B were present. Then another type was discovered this is known as AB, in which both antigens are present. In 1932 Dr. Leon Lattes invented a way to test for antibodies in dried blood flakes. Thanks to these discoveries doctors and forensic scientist have been able to help many people.
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