Twelve families with Hb 0 Arab in the Burgas district of Bulgaria observations on sixteen examples of Hb 0 β° thalassaemia

12 families with Hb 0 Arab from the Burgas district of Bulgaria were examined. Of the 262 members of the 12 families, 44 persons were simple Hb 0 Arab heterozygotes, 18 had β-thalassaemia, and 16 were double heterozygotes for Hb 0 Arab and β° thalassaemia.