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In this investigation we studied the blood group affiliation of the Bulgarian population from Middle Mizia according to the ABO systems and Rhesus factor in connection with the complicated ethnos of the Bulgarians. The sample comprised 769 individuals of both sexes. The defined distribution of the groups from the ABO system was established in the studied population. The comparison with a control group from the Bulgarian population was made. The following differences were established - a decreased presence of the blood group A and an increasing of the blood group B and of the blood group AB The differences by the blood group A are significant. There are no differences by the Rhesus factor. According to the group from Troyan, however, the data shows a presence of a mongoloid admixture. A significant decreasing of the blood group A was observed and weak presence of the negative Resus factor

Blood-group characteristics of the contemporary Bulgarian population from Midddle Mizia