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Antigens of Histoplasma capsulatum. II. Separation and characterization of yeast-phase precipitinogens.

Yeast-phase precipitinogens of Histoplasma capsulatum were obtained from filtrates and from sonically and mechanically disrupted cells. Antigens were checked against burro and rabbit antiserums to the whole organism by micro and macro gel diffusion and by immunoelectrophoresis. The largest number of precipitin lines obtained in any single test was 10; this was taken as an estimate of the minimal number of precipitinogens produced by the organism. Conditions that permitted the detection of ten antigens were the use of growth filtrate from 30-day or 100-day cultures concentrated 500-fold as antigen, hyperimmune burro antiserum concentrated to 150 mg per ml, and assay by micro gel diffusion. Any changes in these conditions resulted in no more and usually considerably less than ten precipitin lines.