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Fair in cases that are rapidly treated but poor in foals with evidence of hypovolaemia and septic shock. Surgical cases also carry a poorer prognosis than cases which are resolved medically.<ref name="Merck">Merck & Co (2008) '''The Merck Veterinary Manual (Eighth Edition)''', ''Merial''.</ref> In a recent study, long term survival of 25 affected horses was 33%.<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>: Failure to relieve the impaction may lead to intestinal rupture.<ref name="Merck">Merck & Co (2008) '''The Merck Veterinary Manual (Eighth Edition)''', ''Merial''.</ref>
Fair in cases that are rapidly treated but poor in foals with evidence of hypovolaemia and septic shock. Surgical cases also carry a poorer prognosis than cases which are resolved medically.<ref name="Merck">Merck & Co (2008) '''The Merck Veterinary Manual (Eighth Edition)''', ''Merial''.</ref> In a recent study, long term survival of 25 affected horses was 33%.<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>: Failure to relieve the impaction may lead to intestinal rupture.<ref name="Merck">Merck & Co (2008) '''The Merck Veterinary Manual (Eighth Edition)''', ''Merial''.</ref>
==Prevention==
==Prevention==
*Mares should be bathed and their udders washed before arrival at foaling premises to remove any sticky ascarid eggs on the coat.
*Mares should be bathed and their udders washed before arrival at foaling premises to remove any sticky ascarid eggs on the coat.
===Avoiding [[Anthelmintic Resistance]]===
===Avoiding [[Anthelmintic Resistance]]===