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*''S. vulgaris'':  
 
*''S. vulgaris'':  
 
**Potentially highly pathogenic
 
**Potentially highly pathogenic
**Damage to cranial mesenteric artery → endarteritis → thrombosis and possibly embolism → colic
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**Damage to cranial mesenteric artery → [[Verminous Endarteritis|endarteritis]] → thrombosis and possibly embolism → colic
 
*Other ''Strongylus'' species :
 
*Other ''Strongylus'' species :
 
**Relatively non-pathogenic
 
**Relatively non-pathogenic
 
**Migration of ''S. edentatus'' and ''S. equinus'' confined to roomy tissues (e.g. mesentery, liver)
 
**Migration of ''S. edentatus'' and ''S. equinus'' confined to roomy tissues (e.g. mesentery, liver)
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==== Verminous endarteritis ====
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==Test yourself with the Horse Nematode Flashcards==
*Caused by larvae of ''S. vulgaris'' within the cranial mesenteric artery
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*Also called "verminous aneurism" (misnomer as aneurism = dilatation/thinning of blood vessel wall; also, aneurisms are rare)
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[[Horse_Nematode_Flashcards|Horse Nematode Flashcards]]
*Wall of artery grossly thickened (organising thrombi, inflammatory responses)
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*Can be detected on rectal palpation
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[[Category:Horse Nematodes]]
*Many cases asymptomatic
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*May get embolism → infarction of areas of intestinal wall → colic or chronic ulceration (note: generally good collateral circulation; therefore colic is not inevitable)
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*Aberrant larvae may cause thrombosis in other arteries; e.g. iliac, cerebral, coronary
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*Avermectin/milbemycins or fenbendazole are used to control migrating ''S. vulgaris'' larvae[[Category:Horse Nematodes]]
 
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