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Every one of 107 Guarani Brazilian Indians examined was found to belong to group O. The authors cite Snyder's study on pure American Indians (91.3 per cent group O) and Vela's study on Indians of Equador (95.5 per cent group O), but evidently overlooked the study by Larreta on 200 pure Indians in Peru, all of whom were found to belong to group O (Wiener, A. S.: Blood Groups and Blood Transfusion, Charles C. Thomas, 1935, pp. 156, 166). The authors have also overlooked the study of Matson and Schrader (J. Immunol.25:155 [Aug.] 1933), who found that of 115 full-blooded Blackfeet Indians 23.5 per cent belonged to group O and 76.5 per cent to group A. The study by Matson and Schrader is the only exception to the general rule that pure Indians all belong to group O. Thus far these interesting observations in Indians have not been
Grupo sanguineo dos Indios Guaranys. JAMA. 1935;104(23):2121-2122. doi:10.1001/jama.1935.02760230069036