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Background  Infection with  Bartonella  species is common in cats but reported effects of bacteremia on laboratory variables differ.    Objectives  Evaluate for associations between  Bartonella  bacteremia and CBC and serum biochemical changes in sick and healthy cats throughout the United States.    Animals  A total of 3964 client‐owned cats.    Methods  Retrospective cohort study using submissions to a commercial laboratory between 2011 and 2017. Serum biochemistry and CBC abnormalities (categorized as above or below reference intervals), age, and location (high‐ or low‐risk state for  Ctenocephalides felis ) in presumed healthy and sick cats were evaluated for associations with presence of  Bartonella  spp. DNA, detected by PCR. Univariate and multivariable logistic regression analyses were performed.    Results   Bartonella  spp. DNA was amplified from 127 (3.2%) of 3964 cats; 126 (99.2%) of 127 were from high flea risk states and 121 (95.3%) of 127 were presumed sick. Fever of unknown origin was the most common PCR panel requested. In the multivariable analysis, neutrophilia, decreased ALP activity, clinical status (presumed sick), and young age (≤2 years) each were positively associated whereas neutropenia and hyperproteinemia both were negatively associated with  Bartonella  spp. bacteremia. Presence of  Bartonella  spp. DNA had no association with test results for other infectious disease agents.    Conclusions and Clinical Importance  In both healthy and sick cats, active  Bartonella  infections had minimal association with clinically relevant laboratory abnormalities. However, based on these results, in areas considered high risk for  C. felis , active infection with  Bartonella  spp. is a reasonable differential diagnosis for cats presented with unexplained fever and neutrophilia, particularly if the cat is young.

journal of veterinary internal medicine

Associations between presence of  Bartonella  species deoxyribonucleic acid and complete blood cell count and serum biochemical changes in client‐owned cats