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Jul 10, 13 · There is a possibility that a mother whose blood group is Rh negative, carries a child whose blood group is Rh positive, and if mother's blood comes in contact with the fetus blood, then the mother's immune system upon finding an antigen foreign to its body, Rh D antigen, will produce antibodies against the Rh parties in the fetus bloodJul 28, 18 · The Bombay blood type is one of the rarest too Credits Though not as precious as golden blood, the Bombay blood type is also considered one of the rarest Found in less than % of the worldPortugal – 05% Singapore – 12% So it is safe to confer that the rarest blood type in the ABO and Rh blood grouping system is the AB Negative This blood group is consistently a rare specimen in all the countries of the world Rhnegative is so rare that is Rarest Blood Type On Earth How Unusual Your Blood Type Storytimes Rh-null blood group in india hindi