Changes

==== Pathogenicity ====

==== Pathogenicity ====

*Larvae (L4) - feed on colon mucosa, nip off epithelium, not true plug-feeders (erosions).

*Larvae (L4) - feed on colon mucosa, nip off epithelium, not true plug-feeders (erosions).

*Adults - non-pathogenic, feed on gut contents; but egg-laying activity of female worms irritant (''pruritis ani''), broken hair and bare patches over rump and tail head (seat itch).

*Adults - non-pathogenic, feed on gut contents; but egg-laying activity of female worms irritant (''pruritus ani''), broken hair and bare patches over rump and tail head (seat itch).

==== Diagnosis ====

==== Diagnosis ====