O blood type isn't /that/ rare...
He probably had AB + blood. The Red Cross website says that, "Only 3 percent of people in the U.S. have AB-positive blood type. AB-positive type blood donors are universal donors of plasma, which is often used in emergencies, for newborns and for patients requiring massive transfusions"
You can only donate blood every 56 days... I've literally seen doctors turn down using the blood when it was donated before 56 days. I have no idea why that is but yeah...
AB is universal recipient. O is universal donor, as well as 47% of the population. Hardly rare.
O- is the blood type of a universal donor..not O+
There are other important factors involved as well such as race e.g. 8% of Caucasians are O- but only 1% of Asians are. Also, apart from the letter and the +/-, there are other antigens that affect who can receive what blood.
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