Which is the rarest of the ABO/Rh blood groups in humans worldwide?
AB negative is the least common blood type found in humans with a distribution of about 0.6%, or 6 in every 1000 people.
There are 8 basic types of blood, A, B, O and AB each with a positive or negative Rhesus characteristic. Of the eight, six have a low distribution under 10% whilst the two remaining types are much more common, with a distribution of 30% or more in humans. See table below showing blood group and percentage distribution.
A + 34%
A - 9%
B +. 8%
B - 2%
O +. 36%
O - 8%
AB + 2%
AB - < 1%
Figures can differ slightly depending on different parts of the world and ethnicity.
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