Difference between revisions of "Oxyuris equi"
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==== 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 ('' | + | *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 ==== | ||
Revision as of 09:57, 2 June 2010
OXYURIS EQUI
General
- Pinworm; caecum; large intestine; rectum.
- Very common.
Morphology
- Female worms, <10cm long, white, long pointed tail.
- Male worms, <1cm (difficult to see).
Life-Cycle
- Adults in lumen of colon.
- Female migrates to anus, lay eggs on perianal hair (white streaks on hair; operculate eggs, 80-90µm, flattened on one side).
- Eggs fall to ground, L3 develops inside egg, ingested, L3 invades colonic mucosa, emerges as L4 matures.
- Prepatent period = 5months.
Pathogenicity
- 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 (pruritus ani), broken hair and bare patches over rump and tail head (seat itch).
Diagnosis
- Clinical signs.
- Egg streaks on perianal hair (sample using sellotape, place on slide).
- Faeces on gound (adult female worms).
Control
- Regular anthelmintic treatment.
- Sponge perianal region frequently when clinical signs present (scald sponge after).