Rarest Blood Group
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A type of Bombay blood (subtype h-h) has so far been found only in Czechoslovak nurse in 1961 and in a brother (Rhesus positive) and sister (Rehsus negative) named Jalbert in Massachusetts, USA, reported in February 1968. Using the ABO system, one of 14 systems, group AB occurs in less than 3% of persons in the UK and 1% in the USA.
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