Difference between revisions of "Oxyuris equi"

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=== ''OXYURIS EQUI'' ===
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{{OpenPagesTop}}
==== General ====
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{{Taxobox
*Pinworm; caecum; large intestine; rectum.
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|name              = ''Oxyuris equi
*Very common.
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|kingdom            =  
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|phylum            =  
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|class              = [[Nematodes|Nematoda]]
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|sub-class          =
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|order              =  
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|super-family      = [[Oxyuroidea]]
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|family            =  
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|sub-family        =
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|genus              =  
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|species            = ''Oxyuris equi
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}}
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Also known as: '''''Equine pinworm — Pinworm — Rat-tail
  
==== Morphology ====
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==Introduction==
*Female worms, <10cm long, white, long pointed tail.
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''Oxyuris equi'' is a pinworm, of the superfamily [[Oxyuroidea]], and found specifically in horses.  It is seen relatively commonly, and its presence is often a result of poor worming protocol. It is found primarily in the caecum, large intestine and the rectum.
*Male worms, <1cm (difficult to see).
 
  
==== Life-Cycle ====
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==Identification==
*Adults in lumen of colon.
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The female worms are large, grey worms often greater than 10cm in length, with a long pointed tail.
*Female migrates to anus, lay eggs on perianal hair (white streaks on hair; operculate eggs, 80-90µm, flattened on one side).
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The male worms are smaller, generally less than 1cm in length.
*Eggs fall to ground, L3 develops inside egg, ingested, L3 invades colonic mucosa, emerges as L4 matures.
 
*Prepatent period = 5months.
 
  
==== Pathogenicity ====
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The ''O. equi'' eggs are ovoid, and yellow.  The egg shell is thick, and is slightly flattened on one side. They are 80-90µm in size.
*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).
 
  
==== Diagnosis ====
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==Life-Cycle==
*Clinical signs.
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Both the male and female adults are fixed in lumen of colon, and the caecum. After fertilization, the female migrates towards the rectum. They then lay their sticky eggs in the perineal region.  After 4-5 days, the infective L3 develop. The shell then crumbles and the L3 are released into the immediate environment.
*Egg streaks on perianal hair (sample using sellotape, place on slide).
 
*Faeces on gound (adult female worms).
 
  
==== Control ====
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The horse then ingests the eggs containing the infective L3.  These then transform into L4, and then attach to the mucosa of the intestine, and the cycle continues.
*Regular anthelmintic treatment.
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The Prepatent period for '''Oxyuris equi''' is 5 months.
*Sponge perianal region frequently when clinical signs present (scald sponge after).[[Category:Oxyuroidea]]
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{{Learning
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|flashcards = [[Horse_Nematode_Flashcards|Horse Nematode Flashcards]]
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|literature search = [http://www.cabdirect.org/search.html?q=title%3A%28%22Oxyuris+equi%22%29 ''Oxyuris equi'' publications]
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|Vetstream = [https://www.vetstream.com/canis/search?s=nematode Nematodes]
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}}
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{{OpenPages}}
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[[Category:Oxyuroidea]]
 
[[Category:Horse_Nematodes]]
 
[[Category:Horse_Nematodes]]
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[[Category:Expert_Review]]

Latest revision as of 17:49, 4 June 2016


Oxyuris equi
Class Nematoda
Super-family Oxyuroidea
Species Oxyuris equi

Also known as: Equine pinworm — Pinworm — Rat-tail

Introduction

Oxyuris equi is a pinworm, of the superfamily Oxyuroidea, and found specifically in horses. It is seen relatively commonly, and its presence is often a result of poor worming protocol. It is found primarily in the caecum, large intestine and the rectum.

Identification

The female worms are large, grey worms often greater than 10cm in length, with a long pointed tail. The male worms are smaller, generally less than 1cm in length.

The O. equi eggs are ovoid, and yellow. The egg shell is thick, and is slightly flattened on one side. They are 80-90µm in size.

Life-Cycle

Both the male and female adults are fixed in lumen of colon, and the caecum. After fertilization, the female migrates towards the rectum. They then lay their sticky eggs in the perineal region. After 4-5 days, the infective L3 develop. The shell then crumbles and the L3 are released into the immediate environment.

The horse then ingests the eggs containing the infective L3. These then transform into L4, and then attach to the mucosa of the intestine, and the cycle continues. The Prepatent period for Oxyuris equi is 5 months.


Oxyuris equi Learning Resources
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Vetstream
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Canis, Felis, Lapis or Equis
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Flashcards
Test your knowledge using flashcard type questions
Horse Nematode Flashcards
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Literature Search
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(CABI log in required)
Oxyuris equi publications




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