Abstract
Particulate antigens were prepared in the form of mycelial fragments and spores, or as cell walls from 24 strains of Dermatophilus and from 22 strains of other actinomycetes. The antigen preparations were tested with either non-labeled or fluorescein isothiocyanate labeled antisera or antiserum globulins. Seven particulate antigen groups of Dermatophilus were distinguished. The particulate antigen preparations of Dermatophilus revealed considerable similarity to the serological reaction patterns of endoplasms and exoantigens. No serological relationship was discovered between the particulate antigens of Dermatophilus and of other actinomycetes.

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