An inactivated vaccine against ringworm.

A new vaccine against ringworm, containing the inactivated Trichophyton verrucosum strain, was assessed on guinea pigs and calves under experimental conditions and on three herds of cattle under natural conditions. The vaccine elicited a distinct immune response of the cellular type. This type of immunity assessed by the migration inhibition test of leukocytes corresponded to the immunity evaluated by the challenge. In herds in which there were from 30 to 67% of naturally infected animals with T. verrucosum, two doses of the vaccine resulted in after 4 weeks a decrease of the number of animals with clinical changes from 40.5 to 100% depending on the group of animals under study.