Medical treatment using blood or blood components to cure or manage diseases, such as giving blood transfusions or blood plasma.
From Greek 'haima' (blood) + 'therapeia' (healing, treatment). Medical term describing therapeutic use of blood, developed with modern transfusion practices in the 20th century.
The discovery that blood type matters for safe transfusions came from a doctor in Vienna whose simple observation—that some blood combinations killed patients but others worked perfectly—saved millions of people.
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