Zoonoses

Toxocara canis. Egg in fecal smear (unstained, high power). This large egg, though never seen in human feces, is common in dogs, especially puppies. Its significance lies in the fact that ingestion by humans, especially children, of infective eggs from contaminated soil may result in visceral larva migrans. The egg has a thick, pitted shell and is unembryonated when passed in feces.