Antiserum has been prepared in rabbits against the H and M antigens of H. capsulatum with immunoelectrophoretic precipitin arcs used as vaccines. The antiserum is specific for H. capsulatum in the immunodiffusion test and can be used as reference serum for identifying antibodies to these antigens in sera from suspected cases histoplasmosis. We found that (1) hand m antigens are not located on the surface of yeast-phase cells and (ii) complement fixation releases the antigens reactive in the complement fixation test from yeast-phase cells.
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