Exam II - Parascaris equorum Flashcards
What is/are the host(s) for Parascaris equorum?
All equids
Describe the appearance of the Parascaris equorum adult
Adults are long, 30 cm, white to cream colored with 3 large lips
Describe the appearance of the Parascaris equorum egg
Ascarid egg: thick-walled, 90 um
What is the PPP for Parascaris equorum?
2.5 months
How is Parascaris equorum transmitter?
per os
there is no transmammary or transplacental transmission of Parascaris equorum
Is the Parascaris equorum life cycle direct or indirect?
direct.
Describe the Parascaris equorum life cycle
- Infective stage (L2 in egg) is swallowed, hatches in intestine
- L2 burrows through intestinal well, liver, lungs (hepatic-tracheal migration
- L2 develops to L3, migrate from trachea, are swallowed, develop to L<strong>4</strong> and migrate to small intestine 14-17 days after infection
- Develop to adults, which copulate and the fertilized female lays eggs that pass through feces
What is the infective stage for Parascaris equorum?
L2 in egg
What is/are the site(s) of infection for Parascaris equorum?
small intestine
Describe any pathogenesis associated with Parascaris equorum
perforation, obstruction, unthriftiness, production losses
What are some clinical signs associated with Parascaris equorum?
unthriftiness with moderate/heavy infections
coughing during migratory phase
How would you diagnose Parascaris equorum?
fecal exam (float or McMaster) for eggs, however eggs may be absent in spite of clinical signs
Describe some treatment & prevention options for Parascaris equorum
anthelminthics. Treatment is not recommended before 60 days of age (when ascarids are small & immature i.e. not egg laying)
Which animals are most susceptible to Parascaris equorum?
young animals
