Term
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Definition
Horse bots "stomach bots"
larvae of the bot fly are the endoparasites
Larvae live in: stomach and duodenum
2 spp.- Gasterophilus intestinalis (cause stomach ulcers when they migrate) and Gasterophilus nasalis (burrow under skin to mouth causing lesions to form)
Larvae of fly |
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Term
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Definition
Habronema and Draschia "stomach worms"
Nematodes
Adult worms in stomach don't cause as much damage as the migrating larvae. They
form thickened nodules in stomach and
cause "summer sores" on skin
larvae migrate and form lesions/nodules |
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Term
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Definition
Parascaris equorum "roundworm"
Ascarid
Nematode
Adults live in: Small intestine>feces>ingested>small intestine>liver(via hepatic portal vein)>lungs>small intestine again
mostly foals, predisposes to pneumonia
Eggs resistant to weather and can live >10 years
Clinical signs: none, unthriftiness, distended abdomen, anorexia, colic, cough
round/oval 90-100um |
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Term
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Definition
Equine Strongyles
Nematodes
Small and 3 Large (vulgaris, edentatus, equinus)
large more pathogenic than small
L3 infective stage, in artery or at intestines can cause aneurysm or clots
report as "Strongyle type eggs"
oval 70-90um X 40-50um |
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Term
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Definition
Oxyuris equi "pinworm"
Nematode
Adults live in: cecum, colon, and rectum
cause pruritus
diagnose with cellophane tape preparation
efficient, don't migrate, stay with host Human and equine pinworms NOT zoonotic
oval 40-90um operculum at one end (like SA flukes) flattened on one side may be larvated |
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Term
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Definition
Equine Castodes "tapeworms"
3 spp.
Anoplocephala perfoliata
Anoplocephala magna
Paranocephala mamilliana
Adults live in: stomach, small and large intestine, and the cecum
Clinical signs: Unthriftiness and +/- anemia
Slows intestinal motility, causescolic and infection between the small and large intestine
hard to find in fecal
Intermediate host: Oribated mite
3 layered shell piriform (pear shaped)apparatus 37-80um angular like Moniezia |
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Term
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Definition
Eimeria leuckarti "coccidia"
A protozoan coccidian
large oocyst for a coccidian
Adult live in: Small intestine
oocyst dark brown "watermelon seed" pore at one end 55-60um X80-87um |
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