PARASITES AND PARASITIC DISEASES OF DOMESTIC ANIMALS


Toxascaris leonina

Life Cycle

Toxascaris leonina has the most straightforward lifecycle of the dog and cat ascarids.   Dog and cat definitive hosts may become infected in two ways:

  1. Ingestion of infective eggs containing second-stage larvae.
  2. Ingestion of intermediate hosts containing encysted third-stage larvae.

Since there is no somatic migration in dogs and cats, there are no prenatal or transmammary infections.  Mice, and to a lesser extent, other rodents and chickens, may serve as paratenic hosts for T. leonina.

 

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Parasites and Parasitic Diseases of Domestic Animals
Dr. Colin Johnstone (principal author)
Copyright 1998 University of Pennsylvania
This page was last modified on January 24, 2000