A spontaneous Yersinia pseudotuberculosis-infection in a monkey-colony.

A spontaneous Yersinia pseudotuberculosis (Y.p.) infection in one African Green Monkey (Cercopithecus aethiops), and nine Squirrel Monkeys (Saimiri sciureus), is reported. The clinical findings, laboratory results and pathological findings are presented. The digestive system was the most affected organ in the acute phase of the Y.p. infection, while in the subacute and chronic phases, the alterations of the lymphatic tissues, spleen or liver were severe.