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''Strongylus vulgaris'' is a parasite of horses.
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''Strongylus vulgaris'' is a clinically important parasite causing verminous arteritis and was a very common cause of colic in horses.  Its prevalence has been on the decrease since the use of wormers containing ivermectin.
    
==Appearance==
 
==Appearance==
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*Well developed buccal capsule in male
 
*Well developed buccal capsule in male
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==Life cycle==
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===Life cycle===
*Eggs shed in faeces onto pasture
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The ''S. vulgaris'' eggs are shed in the faeces.  Under optimal conditions of high humidity and temperatures over 10 degrees, the eggs will transform into rhabditiform L1 larvae within a few days.
*Develop into L3 larvae
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*Ingested by horse
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They then transform into L2, and subsequently L3 without leaving the parasite envelope.  L3 are ingested by the host when feeding on pasture.
*Penetrate intestine mucosa
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*Moult in 7 days to L4 in sub-mucosa
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*L4 migrate to cranial mesenteric artery
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*Develop over months
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*Moult to L5
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*Migrate to caecum and colon
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*Form nodules around the larvae
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*Nodules rupture into the lumen of the intestine
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*Adults live in the caecum and colon
      
==Pathogenesis==
 
==Pathogenesis==
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