Surgery from 1900 – 2000
1901: Discovery of the main blood types A, B, AB and 0 by Karl Landsteiner (1868 – 1943) an Austrian doctor, biologist and immunologist. His findings led to the first successful blood transfer in New York in 1907. In 1923 he discovered the rhesus factor, allowing blood to be transfused safely.1 1906
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