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Flashcards in Ascarids 2 Deck (15):
1

What are some of the physical features associated with Parascaris equorum?

  • 3 lips
  • NO cervical alae
  • NO male bursa
  • Large/stout
  • Off-white

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2

What are some characteristics of Parascaris equorum eggs?

  • Rust brown 
  • Pitted shell
  • Round / ellipsoidal
  • Sticky
  • Albuminous surface

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3

  1. What are the modes of transmission of Parascaris equorum?
  2. What are its means of migration?

  1. ONLY fecal-oral
  2. ONLY liver-lung-tracheal-small intestine migration

4

What is the pre-patent period of Parascaris equorum?

10 - 14 weeks

5

Name 2 of the Ascarids that do NOT have hypobiotic larvae:

  1. Parascaris equorum
  2. Toxascaris leonina

 

(NO transplacental transmission)

(NO transmammary transmission)

6

If this is a liver of a horse, what parasite is responsible?

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Parascaris equorum

7

How might a horse present with a Parascarius equorum larva infection of the lungs?

  • Pneumonia
  • Cough
  • Fever
  • Increased respiration rate
  • White to green nasal discharge

8

How might a horse present with a Parascaris equorum infection of the small intestine with adults worms?

  • Pot belly
  • Poor growth
  • Diarrha / constipation
  • Rough hair coat
  • Colic

9

  1. If you had a foal infected with this, what might you treat with?
  2. What should be your protocol?

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  1. Benzimidazoles
  2. Treat at 2-3 months of age, treat at weaning (6 months of age) treat at 9-12 months of age (for strongyles)

10

  1. When a foal has a heavy infection with Parascaris equorum, how would you recommend treating?
  2. Why?
  3. Which antihelmintics would you NOT recommend?

  1. Benzimidazoles
  2. Benzimidazoles have a slower kill, whereas macrocyclic lactones and nicotinic agonists causes paralysis and could lead to obstruction of the bowel.  
  3. Do NOT use ivermectins, pyrantel, or piperazine, 

11

How long after passing through with the feces do Parascaris egges become infective?

10 days

12

  1. Which Ascarids are NOT infective upon passage with the feces?
  2. How long before their eggs are infective?

  1. Parascarius equorum, Toxascaris leonina, & Ascaris suum
  2. 10 days for Parascaris equorum / 6 - 10 days for Toxascaris leonina / ?

13

What are the physical features of Ascaris suum?

  • NO alae
  • 3 lips

14

  1. This is an egg of what?
  2. What animal species houses this parasite?
  3. What are some specific characteristics of the egg?

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  1. Ascaris suum
  2. Pig
  3. Egg characteristics:
    1. Thick shell
    2. Rough outer covering with projections
    3. Single cell inside
    4. Rust brown
    5. STICKY!

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