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==== 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).
−*Causes transient [[Nasal Cavity Inflammatory - Pathology#Infectious causes of rhinitis|nasal discharge]] when migrating through [[Lungs Inflammatory - Pathology#Infectious causes of pneumonia|lungs]]
−**Foals and weanlings
The prepatent period of ''P. equorum'' is 10-16 weeks.
The prepatent period of ''P. equorum'' is 10-16 weeks.
−[[Category:Ascaridoidea]][[Category:Horse_Nematodes]]
[[Category:Ascaridoidea]][[Category:Horse_Nematodes]]
[[Category:To_Do_-_Max]]
[[Category:To_Do_-_Max]]