Abstract
Summary 1. A case of naturally occurring toxoplasmosis in the dog is reported. It is the first instance of canine toxoplasmosis reported from the Canal Zone. 2. Similarity of pathologic changes in human and animal toxoplasmosis is stressed. Calcific change due to parasitization of heart muscle is described. 3. The possibility of various methods of transmission of the disease from the dog to man is discussed.

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