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Clinical Pathology I

Nematodes in Horses

QuestionAnswer
A skin condition seen in equines that is commonly called summer sores is caused by which parasitic larvae? Habronema and Draschia species
Habronema and Draschia species are commonly called what in horses? stomach worms
Habronema and Draschia are also found in equine stomachs. True or False True
How does the horse become internally infected with Habronema and Draschia? By accidental ingestion of a Muscidae fly
The equine roundworm or equine ascarid is also called what? Parascaris equorum
Where does the adult equine roundworm live within the body? small intestine
How does a horse become infected with Parascaris equorum? by ingesting infected ova
What is the life cycle of Parascaris equorum? eggs passed in feces, egg is ingested by foal, hatches in intestines, larvae migrate to liver thru hepatic portal vein, grow to next stage, then larvae go to lungs in circulation, foal coughs them up, and swallows. Repeat cycle.
Which of the equine strongyles are the most pathogenic, large or small? large
What are the scientific names of the large strongyles of horses? Strongylus vulgaris, Strongylus edentaus, and Strongylus equinus
How do we tell the difference in the different species of strongyles in horses? You can't!! They all look too similiar to each other. That is why we call them all strongyles or you can say "a strongyle type of egg"
What method of collection is used to collect Oxyuris equi? tape prep
What is the common name for Oxyuris equi? pinworm
What area of the horse is usually bothered by pinworms? The tail head and anus and rump
Why is it rare to find Oxyuris equi ova on a flotation test? the female attaches her eggs to the anus instead of the eggs being in the feces
True or False-Stronglyoides westeri only have parasitic male worms. False--They only have parthenogenetic females!! They don't need a man!!!
How would the ova of Strongyloides westeri look if it is seen under the microscope? the ova would have a larvae moving around in it
What is the scientific name of the equine lungworm? Dictyocaulus arnfieldi
Where is the nuchal ligament found in horses? neck
What microfilaria can be found in the nuchal ligament? Onchocerca cervicalis
Horses infected with Onchocerca cervicalis exhibit patchy alopecia and scaling on the head, neck, shoulders, and ventral midline with severe pruritis and this is commonly called what? cutaneous onchocerciasis
What other abnormal condition can Onchocerca cervicalis cause in horses? blindness and periodic opthalmia
Created by: spoitevint