Endoparasites Flashcards
5 Colic worms in horses
- Gastrodiscus aegiptiacus
- Anoplocephala perfoliata / magna
- Strongyloides westeri
- Strongylus vulgaris (large strongyle)
- Cyathostomins (small strongyles)
ID
Gastrodiscus aegiptiacus
(Conical fluke)
ID
Anaplocephala perfoliata
(Most common intestinal tapeworm in horses)
ID
Strongyloides westeri
(Equine threadworm)
ID
Strongylus vulgaris
(Blood worm)
ID
Cyathostomins (Small strongyles)
(
ID
Cyathostomin eggs (Small strongyle egg)
ID
Gastrodiscus aeguptiacus
ID
Anaplocephala perfoliata
ID
Strongyloides westeri egg
ID
Strongylus vulgaris
How would you diagnose the following parasites:
Strongylus vulgaris
Strongyloides westeri
Cyathostomins (small strongyles)
Anaplocephala perfoliata / magna
Gastrodiscus aegyptiacus
S. vulgaris - Faecal culture
S. westeri - Faecal floatation
Cyathostomins - Worms in faeces
A. perfoliata / magna - Faecal floatation / segments
G. aegyptiacus - Flukes in faeces / Faecal sedimentiation
How does this worm cause colic?
- Larvae migrate through the mesenteric arteries and branches
- Damage endothelia cellc; thrombus formation
- Non-strangulating infarctions of the large intestine
- Adults return to caecum / colon
How does this parasite cause colic
- Caecal intussusception
- Typhlocolitis
How does this parasite cause
- Foals are infected during nursing (mare’s milk)
- In the foals the larvae undergo pulmonary migration and return to SI
- Cause eneteritis and diarrhoea in foals
How can this parasite cause colic
- Predilection site of attatchment is the ileo-caecal valve
- Ileo-caecal intussusception
- Ileal impaction
- Spasmodic colic
How do these parasites cause colic
- L3 larvae ingested and invade large intestinal mucosa
- Encased, fibrous capsule: “encysted”
- Can go into a state of hypobiosis (autumn)
- Adults form in the lumen of the caecum and colon
ID and suggest treatment
Strogngylus vulgaris
Adult: Ivermectin, Pyrantel, Fenbendazole, Benzimidazole
Larval stage: Ivermectin, Moxidectin,
ID and suggest treatment
Strongyloides westeri
Ivermectin, Moxidectin, Fenbendazole
ID and suggest treatment
Anaplocephala perfoliata / magna
Praziquantal
ID and suggest treatment
Cyathostomins
Ivermectin, Moxidectin
ID and suggest treatment
Gastrodiscus aegyptiacus
Off label: Tramizan
Oxyclozanide (used in ruminants)
ID and name the most common parasite
Bot fly
Gastrophilus intestinalis
(Gastrophilus nasalis)
ID and suggest treatment / prevention
Gastrophilus intestinalis
Eliminate botfly larvae - physically remove eggs from hair
Avermectin anthelminthic
ID and predilection site
Parascaris equorum
Small intestine
