AbstractThe ABO group, Lewis type and secretor status were determined in 546 normal individuals (241 male, 305 female). Their serum was tested at 4°C for agglutination of group O red blood cells; the antibody was presumed to be auto‐anti‐I; the results were expressed as a score. Among non‐A female donors, the score was higher for secretors than nonsecretors (p<0.05). Among non‐A secretors of both sexes, female donors had a higher score than male donors (p<0.05). These results suggest that the level of anti‐I in the serum of normal individuals may be affected by the donor's ABO group, secretor stat
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