. Calves vaccinated against Trichophyton verrucosum were resistant to experimental infection with T. verrucosum strain and T. mentagrophytes strain. Immunization with a vaccine containing T. mentagrophytes produced reliable immunity against the homologous strain but failed to confer a satisfactory degree of protection against the heterologous dermatophyte T. verrucosum. Four out of 12 calves of this group reacted to challenge by development of mycotic changes persisting throughout the observation period. All non-vaccinated controls inoculated with one or the other of the two challenge cultures showed a similar clinical picture of trichophytosis.
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A. Rybnikář (1992) studied this question.
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