Abstract
Anaplasmosis is a vector-borne disease caused by Anaplasma (A.) spp. which currently is still rarely diagnosed in cats. This article describes 3 independent cases of anaplasmosis in cats from different regions of Germany presented to veterinarians in 2021. All cats showed unspecific clinical signs, such as fever, reduced general condition, and decreased appetite. One cat additionally had generalized limb pain, another showed reluctance to move as well as vomiting. On complete blood cell count, only 1 of 3 cats showed mild thrombocytopenia. A. phagocytophilum was detected in blood samples of all 3 cats by polymerase chain reaction. Additionally, in 2 cats (in which blood smears were evaluated) morulae could be detected within neutrophilic granulocytes. Initially, all 3 cats had highly elevated serum amyloid A (SAA) concentrations. Treatment with doxycycline caused a rapid improvement of clinical signs, followed by a decrease of SAA concentrations to normal levels as well as negative PCR results after a treatment duration of at least 28 days. In cats with fever, otherwise unspecific clinical signs with only mild or no hematological changes, elevated SAA concentrations, and previous exposure to ticks, attending veterinarians should consider anaplasmosis as differential diagnosis.
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