Equine endoparasites – Flashcards
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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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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 skinlarvae migrate and form lesions/nodules |
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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, coughround/oval 90-100um |
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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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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 zoonoticoval 40-90um operculum at one end (like SA flukes) flattened on one side may be larvated |
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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 mite3 layered shell piriform (pear shaped)apparatus 37-80um angular like Moniezia |
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Eimeria leuckarti "coccidia" A protozoan coccidian large oocyst for a coccidianAdult live in: Small intestineoocyst dark brown "watermelon seed" pore at one end 55-60um X80-87um |
