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.