Horse Nematode Flashcards

Question	Answer		Article
Which equine nematode species may be found in the large intestine?	Strongylus species Cyathostomins Triodontophorus species Oxyuris equi		Link to Article
Describe the gross morphology of large strongyles	Stout worms, 1.5-5cm long Large buccal capsule Bursa visible to the naked eye (male worms only)		Link to Article
What is the cause of verminous endarteritis?	The larvae of S. vulgaris within the cranial mesenteric artery		Link to Article
Describe the pathogenicity of small strongyles	Adult and larval worms are plug feeders, restricting the damage to more superficial mucosa		Link to Article
What are the sources of infections of strongyles?	Overwintered L3 on pasture Many adult horses pass significant numbers of strongyle eggs throughout their lives Spring rise in faecal egg output occurs in both breeding and non-breeding horses		Link to Article
Describe how features of Parascaris equorum eggs aid their resistance in the environment?	Thick, pitted shell ensures prolonged survival (>1year) Sticky outer shell aids passive spread		Link to Article
Which is generally the first parasite to which foals are exposed?	Strongyloides westeri		Link to Article
Describe the pathogenicity of Oxyuris equi larvae	Feed on colon mucosa Nip off epithelium Not true plug-feeders (erosions)		Link to Article
Name the Spiruroids that can occur in the equine stomach	Habronema microstoma Draschia megastoma		Link to Article
What is the pathogenicity of the equine lungworm Dictyocaulus arnfieldi?	Raised areas of over-inflated pulmonary tissue (several cms in diameter) surrounding small bronchus containing worms and mucopurulent exudate Hyperplastic bronchial epithelium Peribronchial cuffing		Link to Article
Name some control strategies for Dictyocaulus arnfieldi	Do not keep horses on pastures grazed by donkeys (potential carriers) Treat donkeys with appropriate anthelmintic in spring if grazed with horses		Link to Article