VACCINATION OF YOUNG CALVES AGAINST TRICHOPHYTOSIS

Calves vaccinated against trichophytosis at 1 to 7 days of age and rev accinated 10 days later showed a satisfactory degree of protection aga inst experimental infection with a virulent strain of Trichophyton ver rucosum. The same results were obtained after immunization of calves i n groups of older animals (aged 8 to 42 days). All non-vaccinated cont rols given the same challenge dose showed extensive trichophytic crust s that persisted throughout the observation period. A field experiment with the same vaccine was conducted in a herd where 50% of the calves were affected with trichophytosis. New arrivals in the calf-house wer e vaccinated at 3 to 6 days of age and revaccinated 10 days later. Of 179 vaccinated animals, 4 (2.2%) developed trichophytosis.