Day 1: Strongyle Flashcards
What is the most important parasites in horses and the phylum name
Strongyles and the phylum is Nemathelminthes
Where are small and large strongyles located
Worldwide
Where are Strongyles located in the horse
Cecum and colon
What are the physical exam findings of a horse with Strongyles
Muscle Wasting
Thin
Poor hair coat
Depressed
Failure to grow
How do horses acquire Strongyles
Through grazing on infectious L3
What is the generalized Life Cycle of Strongyle
Direct life cycle-No intermediate host
How do large strongyles cause damage
By migrating larvae and adults “plug feeding”
Anterior ends of adults have large buccal capsules with teeth
What are the 3 types of Strongyles
Strongyle vulgaris
Strongyle edentatus
Strongyle equinus
What may Strongyle vulgaris look like
Large sized adult worms (2-3 inches)
Have teeth
Suck blood
May appear red in color
Explain the epidemiology of Strongyle vulgaris
Infective L3 are acquired on pasture during grazing
More common in young horses
What is the prepatent period of Strongyle vulgaris
6-7 months
Explain in detail the Strongyle Vulgaris life cycle starting with the ingestion
L3 is ingested and is in the SI and penetrates the intestinal wall where it molts into L4
L4 migrates upstream in artieroles within intima toward cranial mesenteric artery
L4 stays in cranial mesenteric artery for up to 120 days
L4 migrates from artioles to colon wall where it produces nodules
nodules rupture releasing larvae into lumen where they mature to the adult stage
How does the Large Strongyle migrate in the horse?
The horse GI tract folds back on itself allowing larvae to re-enter the GI tract by penetrating the cecal wall
What is the pathology of strongyle vulgaris
Creates occlusion of blood flow and block blood flow from the bowel
Artiel damage can lead to thromboembolism and reduce blood flow in the bowel
Arterial
What are the clinical symptoms of a horse with Large Strongyles
Colic-Due to decreased motility, secondary thromboembolic episodes
Rise in body temperature
Anorexia
Weight loss
Depression
Reluctance to move