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Recent history (within the previous 24 hours) of being wormed with a product effective against ascarids.
 
Recent history (within the previous 24 hours) of being wormed with a product effective against ascarids.
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==Aetiology==
 
==Aetiology==
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Products that cause sudden death<ref name="Bliks">Blikslager, A.T (2010) ''Obstructive Disorders of the Gastrointestinal Tract'' in Reed, S.M, Bayly, W.M. and Sellon, D.C (2010) '''Equine Internal Medicine''' (Third Edition), Chapter 15, ''Saunders''.</ref> or paralysis of ascarids, particularly [[Parascaris equorum|''Parascaris equorum'']] within the small intestine.  Adult ascarids are large and thus readily cause small intestinal impaction.  It has been suggested that disruption of the surface of the ascarid releases antigenic fluids that inhibit intestinal muscular activity, thereby increasing the likelihood of intestinal obstruction.  Anthelmintics that are suspected to induce episodes of ascarid impaction include<ref name="Cribb">Cribb, N.C, Cote, N.M, Boure, L.P, Peregrine, A.S (2006) Acute small intestinal obstruction associated with ''Parascaris equorum'' infection in young horses: 25 cases (9185-2004).  ''N Z Vet J'', 54:338-343.  In: Blikslager, A.T (2010) ''Obstructive Disorders of the Gastrointestinal Tract'' in Reed, S.M, Bayly, W.M. and Sellon, D.C (2010) '''Equine Internal Medicine''' (Third Edition), Chapter 15, ''Saunders''.</ref>:
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Products that cause sudden death<ref name="Bliks">Blikslager, A.T (2010) ''Obstructive Disorders of the Gastrointestinal Tract'' in Reed, S.M, Bayly, W.M. and Sellon, D.C (2010) '''Equine Internal Medicine''' (Third Edition), Chapter 15, ''Saunders''.</ref> or paralysis of ascarids, particularly [[Parascaris equorum|''Parascaris equorum'']] within the small intestine.  Adult ascarids are large and thus readily cause small intestinal impaction.  It has been suggested that disruption of the surface of the ascarid releases antigenic fluids that inhibit intestinal muscular activity, thereby increasing the likelihood of intestinal obstruction.<ref name="Merck">Merck & Co (2008) '''The Merck Veterinary Manual (Eighth Edition)''', ''Merial''.</ref> Anthelmintics that are suspected to induce episodes of ascarid impaction include<ref name="Cribb">Cribb, N.C, Cote, N.M, Boure, L.P, Peregrine, A.S (2006) Acute small intestinal obstruction associated with ''Parascaris equorum'' infection in young horses: 25 cases (9185-2004).  ''N Z Vet J'', 54:338-343.  In: Blikslager, A.T (2010) ''Obstructive Disorders of the Gastrointestinal Tract'' in Reed, S.M, Bayly, W.M. and Sellon, D.C (2010) '''Equine Internal Medicine''' (Third Edition), Chapter 15, ''Saunders''.</ref>:
 
*Organophosphates
 
*Organophosphates
 
*[[Macrocyclic Lactones|Ivermectin]]
 
*[[Macrocyclic Lactones|Ivermectin]]
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