What is the rarest blood type?
The blood group AB is considered the youngest one among the 3 other blood types. It appeared as a result of blending together of the blood groups O and A. This blood type provides people with a flexible immune system. So it seems that being a vessel of such an unusual blood group is cool. But the trouble is that it's almost impossible to find a donor with the blood of this type, especially if you are Rh-negative.
Scientists believe that this blood type is the product of interracial marriages between Indo-Europeans and Asians. But the knowledge of the origin of the phenomenon, however, doesn't make the situation better and there is still a lack of donors with the blood type AB.