Ultrastructural Nature of Canine Distemper Inclusions in the Urinary Bladder

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Abstract
The ultrastructural nature of canine distemper inclusions was studied in the bladder epithelium of 4 dogs. These tissues were compared to 5 control animals. The classical intracytoplasmic inclusion consists of filaments or tubules which are helices of ribonuclcoprotein of the virus. A second type of inclusion is described and occurs in control and infected dogs. The heterogeneous dense body is not related to canine distemper infection.