title: Natural superinfection of Parascaris equorum in a stall-confined orphan horse foal.
abstract: At 4 days of age, an orphan horse foal born on a pasture was placed in a parasite-free stall. It was euthanized at 205 days of age and examination revealed numerous. Parascaris equorum specimens, ranging from 3.0 mm to adult size, indicating reinfections in the stall over an extended period of time. Initial infection of the foal was from stages on pasture. The foal had been observed repeatedly eating its own feces and the question is posed as to whether "recycling' of P. equorum eggs several times by coprophagy allowed time for embryonation and reinfection to occur.
authors.affiliation: Department of Veterinary Science, Gluck Equine Research Center, University of Kentucky, Lexington 40546-0099, USA.
authors.forename: E T
authors.initials: ET
authors.lastname: Lyons
authors.forename: T W
authors.initials: TW
authors.lastname: Swerczek
authors.forename: S C
authors.initials: SC
authors.lastname: Tolliver
authors.forename: J H
authors.initials: JH
authors.lastname: Drudge
mesh_terms: D000818:Animals; D017162:Ascaridida / Q000302:isolation & purification*; D017191:Ascaridida Infections / Q000469:parasitology / Q000662:veterinary*; D003303:Coprophagia / Q000150:complications; D005243:Feces / Q000469:parasitology; D006734:Horse Diseases / Q000469:parasitology*; D006736:Horses; D007411:Intestinal Diseases, Parasitic / Q000469:parasitology / Q000662:veterinary*; D007421:Intestine, Small / Q000469:parasitology; D008168:Lung / Q000469:parasitology; D008297:Male; D010270:Parasite Egg Count / Q000662:veterinary; D012008:Recurrence; D015163:Superinfection / Q000469:parasitology / Q000662:veterinary*