A search for haemoglobin variants undertaken in Canada revealed 21 unrelated instances of Hb D Punjab amongst 207,300 specimens tested. Of these, eight came from East Indian immigrants and the rest from Canadians of United Kingdom origin. No instances of Hb D Punjab were found in 14,500 specimens from Canadian Indians that were tested. The geographical origins of 27 instances of Hb D Punjab characterized at the MRC Abnormal Haemoglobin Unit, Cambridge are presented. Of these five were natives of the British Isles. The results of surveys undertaken in the United Kingdom are summarized. The global distribution of Hb D Punjab is discussed.
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