Blood from a domestic dog infected with Ehrlichia canis was injected into 3 adult vervet monkeys
Cercopithecus pygerythrus. The monkeys did not develop any clinical or haematological signs of
disease, nor did they seem to be able to harbour the parasite. Furthermore, neither morulae of E. canis
nor haematological evidence of ehrlichiosis were seen after these monkeys had been splenectomized.
The splenectomized monkeys did, however, develop a severe parasitaemia of their red cells with
Entopolypoides macaci. They also showed a transient haematuria, mild inappetence and listlessness.
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