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Created page with '=== ''PARASCARIS EQUORUM'' === ==== General ==== *Ascarid, small intestine. *Mostly in young horses, especially foals <6months old. ==== Morphology ==== *Stout worms, up to 50cm…'
=== ''PARASCARIS EQUORUM'' ===
==== General ====
*Ascarid, small intestine.
*Mostly in young horses, especially foals <6months old.
==== Morphology ====
*Stout worms, up to 50cm long.
*Three large lips around mouth.
==== Life-Cycle ====
*Direct.
*Infection - ingestion of embryonated egg (L2).
*Egg (100µm diameter, brown, thick pitted shell).
*Larvae → hepatotracheal migration (liver → heart → lungs → intestine, 3weeks).
*Prepatent period = 10-12weeks.
==== Pathogenicity ====
*''Larvae'' - eosinophilic tracts and haemorrhages in liver and lungs. Clinically, latter may lead to cough and nasal discharge.
*''Adult worms'' - may cause unthriftiness, weight loss; impaction and intestinal perforation rarely.
==== Epidemiology ====
'''High Fecundity of Female ''Parascaris''''':
*Infected foal may pass millions of eggs per day.
'''Resistance of Eggs in Environment''':
*Thick, pitted shell ensures prolonged survival (>1year).
*Sticky outer shell aids passive spread.
'''Susceptible Animals''':
*Foals (<4months) - transmission from one year's foals to the next, infection normally occurring during the first month of life.
*Adult horses - few worms only (carriers?).
==== Control ====
*Regular anthelmintic treatment.
*Remove faeces from paddocks - collect every 2weeks (takes 2weeks to reach L2 stage).
[[Category:Ascaridoidea]][[Category:Horse_Nematodes]]
==== General ====
*Ascarid, small intestine.
*Mostly in young horses, especially foals <6months old.
==== Morphology ====
*Stout worms, up to 50cm long.
*Three large lips around mouth.
==== Life-Cycle ====
*Direct.
*Infection - ingestion of embryonated egg (L2).
*Egg (100µm diameter, brown, thick pitted shell).
*Larvae → hepatotracheal migration (liver → heart → lungs → intestine, 3weeks).
*Prepatent period = 10-12weeks.
==== Pathogenicity ====
*''Larvae'' - eosinophilic tracts and haemorrhages in liver and lungs. Clinically, latter may lead to cough and nasal discharge.
*''Adult worms'' - may cause unthriftiness, weight loss; impaction and intestinal perforation rarely.
==== Epidemiology ====
'''High Fecundity of Female ''Parascaris''''':
*Infected foal may pass millions of eggs per day.
'''Resistance of Eggs in Environment''':
*Thick, pitted shell ensures prolonged survival (>1year).
*Sticky outer shell aids passive spread.
'''Susceptible Animals''':
*Foals (<4months) - transmission from one year's foals to the next, infection normally occurring during the first month of life.
*Adult horses - few worms only (carriers?).
==== Control ====
*Regular anthelmintic treatment.
*Remove faeces from paddocks - collect every 2weeks (takes 2weeks to reach L2 stage).
[[Category:Ascaridoidea]][[Category:Horse_Nematodes]]