Human cases of infection with canine whipworms, Trichuris vulpis (Froelich, 1789), in Japan.

The eggs of Trichuris, detected in the feces of 19 persons who had stayed in institutions for mentally retarded and/or multi-handicapped patients, were identified as those of T. vulpis (Froelich, 1789) on the basis of morphological features. This is the first record of human infection with the canine whipworm in Japan.