Trichuriasis is caused by various species of Trichuris, nematode parasites in the family Trichuridae. These parasites are also known as whipworms. Both larval and adult whipworms are normally found only in the intestines. They do not undergo tissue migration. Most human cases are caused by Trichuris trichiura, a parasite of humans and some non-human primates. Zoonotic trichuriasis is caused by the animal parasites Trichuris vulpis and Trichuris suis. Adult T. vulpis and T. suis are found occasionally in the intestinal tract of humans. Very rare cases of T. vulpis visceral larva migrans have been reported. Other species of Trichuris are also found in animals, but have not, to date, been reported in humans.