Abstract
Antigenic relationships between strains of A. fumigatus, A. fumigatus var. ellipticus, A. phialiseptus, A. flavus and A. niger were analyzed by fused rocket immunoelectrophoresis and by skin tests. Of the antigens detected between strains and species of the A. fumigatus series, 73-89% were shared. Degree of sharing between antigens of A. flavus, A. fumigatus series and A. niger was much lower and ranged from 19-35%. In reciprocal skin tests in sensitized guinea pigs, similar relationships were shown. Three fractions of A. fumigatus extract were markedly specific for this species. Cross reactivity was associated primarily with carbohydrate and glycoprotein fractions.

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