Depending on the presence of the Rh protein outside of RBCs, a blood group was either positive or negative. Apart from this major classification, the Rh factor also determined blood groups. ![]() ![]() The classification was made based on the presence or absence of certain molecules on the surface of the RBCs. The reason for this rejection wasn’t known until an Austrian biologist, Karl Landsteiner in 1901 broadly classified blood types as A, B, AB and O. A post shared by Hrithik Roshan Prior to 20th century, several deaths were caused because medics believed that transfusing animal blood into human body could be useful (which was definitely not the case), and later, when human blood was given to humans, several cases led to death, because patient's body rejected the blood that was transfused.
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