Typing Haemophilus ducreyi by indirect immunofluorescence assay.

Abstract
Rabbits were inoculated with untreated whole cells of 16 strains of H. ducreyi. Homologous titers in an indirect immunofluorescence test ranged from 1/320-1/1280. No cross reactions, or very few, were observed between antisera to these strains and 22 other (possible taxonomically related) species, strains and genera. A large diversity in types of antigen was observed among the strains of H. ducreyi. Antiserum from 2 antigens (35,000 and 3138), however, reacted with all 16 H. ducreyi antigens tested. At least 9 of the strains of H. ducreyi examined were identified as determining the type of antigen.

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