Hemagglutinins in Sera of Africans of Gambia

Abstract
Summary Thirty-eight sera from Africans of Gambia were studied serologically. Twenty-two sera had increased titers of agglutinins to guinea pig erythrocytes and 20 had increased titers of rat hemagglutinins. Of 19 individuals of blood group O, 9 had increased titers of agglutinins to human A and/or B erythrocytes. Eleven of 38 sera agglutinated human blood group O erythrocytes exposed to trypsin. Possible relation of these serological findings to infectious processes, especially malaria, is discussed.

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