It was in June 1667, and was carried out by the French mathematician Jean Baptiste Denis. He injected sheep's blood into a young man. Five months later, Richard Lower transfused two sheep's blood to the theological student Arthur Coga in England.Although the first transfusions were successful, those that were performed later, unfortunately, caused many deaths and the practice was outlawed. It must be remembered that blood groups were not discovered until 1901, when the Austrian Karl Landsteiner did.
