Infections of Toxocara canis in dogs fed infected mouse tissues

Toxocara canis larvae infecting dogs undergo tracheal migration following their ingestion in an experimental intermediate host. Development of the parasite then proceeds to the adult stage in the small intestine. Adult dogs are therefore capable of distributing fertile T. canis ova which, if ingested, could cause larva mirans in humans and other animals. This work was financed by research grants from the University of Queensland and the National Health and Medical Research Council of Australia. The writer wishes to acknowledge the encouragement and criticism of Professor J. F. A. Sprent.