ABH and Lewis bllod group system: a study on two Amazonian Indian tribes

Phenotype frequencies of the ABH and systems were obtained for 110 individuals belonging to the Arara and Wai-Wai (Katuena tribes) of northern Brazil, who speak languages of the Cariban Stock. only ABH secretor phenotypes were observed, and all of them were of the "O" blood group. The Lewis-positive phenotype was found among the Arara and is also the most frequent among the Wai-Wai indians. Le(a-b-) subjects occurred only among the Wai-Wai, suggesting more variation within this group than among the Arara.