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Cards In This Set
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Parascaris equorum
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Equine large roundworm or ascarid.
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How is the egg of Parascaris equorum killed?
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By hot dry conditions and exposure to sunlight
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Is feeding on pasture necessary for transmission of Parscaris equorum?
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No.
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What are the features of adult parascaris equorum?
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They are 6-8 inches long, off white and have 3 large lips.
They do NOT have alae nor do the males have a bursa. |
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What are the features of a Parascaris equorum?
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They are round to ellipsoidal, 90 to 100 micrometers in diameter. The shell is thick, rust-brown and pitted. It also has a sticky albuminous surface.
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What is the life cycle of Parascaris equorum?
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The adults develop in the SI, lay eggs, the larva develops in the egg in about 10 days, the host ingests the egg with the larva, the larva hatches in the SI, the larva travels to the liver, then the lungs. It gets into the trachea, is coughed up and swallowed and gets into the SI, where the adults develop and reside.
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What is the pre-patent period for Parascaris equorum?
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It is 72-110 days.
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What are the methods of transmission for Parascaris equorum?
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Ingestion - and then migration through the liver and lungs.
NO larval somatic migration NO hypobiotic larvae NO transplacental transmission NO transmammary transmission |
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What are the clinical signs due to Parascaris equorum larvae?
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Verminous pneumonia that is called a "summer cold"
Fever, cough, increased respiratory rate, dirty-white to gray-green mucopurulent nasal discharge. Spontaneous recovery from the signs Possible history of use of antibiotics and a relapse after their use. |
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What are the clinical signs attributed to the adults of Parscaris equorum?
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Pot belly
Rough hair coat poor growth or weight gain Decreased appetite Colic Diarrhea Constipation, Flatulence and pale fetid feces |
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What are the possible complications with Parascaris equorum?
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Changes in gut motility - either increased or decreased
Intussuception or telescoping of the intestine GI obstruction or impaction All of these are generally see in fall or early winter... |
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Between what ages is Parascaris equorum infections usually seen?
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Between 3-9 months of age in foals
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Why is infection with Parascaris equorum only seen in foals?
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In horses older than 6 months, the larvae that are migrating in the liver and lung die and the adults are expelled.
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What is the most important route of transmission of Parascaris equorum?
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From one foal to another
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How is Parascaris equorum infection diagnosed?
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Based on clinical signs
Fecal floatation for eggs Adults in the feces And at Necropsy - adults in the SI |
