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Denis transfused the blood from a sheep to a 15-year old boy and later to a labourer, both of whom survived the transfusions. In 1818, British obstetrician James Blundell successfully transfused human blood to a patient who had hemorrhaged during childbirth. In 1901, Karl Landsteiner, an Austrian physician discovered the first human blood groups, which helped transfusion to become a safer practice.
Pepys recorded in fine detail one of the first attempts at blood transfusion to take place. On this day, November 14, in 1666, Pepys described a transfusion between two dogs.This was just the second such attempt on record, and came just months after the discovery of blood circulation mechanisms through the heart.epys recorded in fine detail one of the first attempts at blood transfusion to take place. On this day, November 14, in 1666, Pepys described a transfusion between two dogs.