New Studies on the Relationship Between Blood Groups and Leprosy

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Abstract
Studies on the A1A2BO, MN and Rh (tests with 5 sera) blood groups of 936 white and 74 negroid leprosy patients are compared with those of 572 white and 384 negroid healthy persons. The subjects were living at the time of the investigation in 3 southern Brazilian cities. No significant differences were observed in the distribution of these systems in patients and normals. Attempts at establishing significant relationships between deviations in phenotype distributions in these systems and the type of leprosy or severity of the disease were also unsuccessful.