Abstract
Haemagglutination-inhibition studies showed that several different allergenic preparations exhibit A and B blood group activity. Most products displayed A-specificity, less often B-specificity; the inhibition titers were usually low. No correlation was evident between isoagglutination-inhibition titers and the complement-consuming capacity or skin-reactivity of the allergens. Absorption of A- and B-isoagglutinins from human serum did not affect the complement consumption by house dust allergens. Hapten-inhibition studies confirmed the non-participation of blood group antibodies in allergen-induced complement consumption. The observed inhibition by D-glucosamine is attributed to a partial structural homology with the lysine-sugar site on house dust allergens.
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