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Three tick-borne diseases in the same dog (case report)
Ehrlichia canis, Hepatozoon canis, and Anaplasma phagocytophilum in the same dog - this is really unusual, even in Greece, where this case report comes from. Since many dogs in Germany are imported from areas where these parasites are endemic it is mandatory even in Germany to know more about clinical signs and diagnosis!

A 5-month-old, female, mongrel dog was admitted to the Clinic of Companion Animal Medicine, Aristotle University of Thessaloniki, Greece, with depression, anorexia, fever, peripheral lymphadenopathy, splenomegaly, oculonasal discharge, nonregenerative anemia, and mild thrombocytopenia.

Cytology of Giemsa-stained buffy coat, bone marrow, and lymph node aspiration smears revealed numerous morulae in mononuclear leukocytes and in neutrophils, and Hepatozoon canis gamonts in neutrophils.

The dog was seropositive to Ehrlichia canis (immunofluorescence assay [IFA]) and Hepatozoon canis (ELISA) but not to Anaplasma phagocytophilum (IFA).

A nested polymerase chain reaction performed on bone marrow aspirates was positive for E canis. This method was not applied for the detection of A phagocytophilum.

Treatment with doxycycline and imidocarb dipropionate resulted in both clinical and parasitologic cure.

This is the first reported case of a mixed infection with E canis, H canis, and presumptive A phagocytophilum.

The findings emphasize the value of cytology in offering a quick and inexpensive diagnosis in mixed tick-borne infections of dogs.


Source: Mylonakis ME, Koutinas AF, Baneth G, Polizopoulou Z, Fytianou A. (2004): Mixed Ehrlichia canis, Hepatozoon canis, and presumptive Anaplasma phagocytophilum infection in a dog. In: Vet Clin Pathol. 2004;33(4):249-51.





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