H, A and A1 reactivity in two Polynesian groups

Polynesian O bloods from Samoans and Tokelau Islanders have the same mean H reactivity as Caucasian, and their A1 bloods the same A1 content. However, Polynesian A1 bloods have significantly greater H reactivity than Caucasian, and the Tokelau Islanders also showed enhanced A and IT. It is suggested that the Polynesian AHI molecular conformation must differ from the Caucasian pattern, providing an arrangement of antigen sites more favourable to some antigen-antibody reactions.