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Journal of Clinical Microbiology, May 1999, p. 1536-1547, Vol. 37, No. 5
0095-1137/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.

Clinical and Pathologic Evaluation of Chronic Bartonella henselae or Bartonella clarridgeiae Infection in Cats

Dorsey L. Kordick,1 Talmage T. Brown,2 KwangOk Shin,2 and Edward B. Breitschwerdt1,*

Departments of Companion Animal and Special Species Medicine1 and Microbiology, Pathology, and Parasitology,2 College of Veterinary Medicine, North Carolina State University, Raleigh, North Carolina 27606

Received 13 July 1998/Returned for modification 1 October 1998/Accepted 26 January 1999

Human Bartonella infections result in diverse medical presentations, whereas many cats appear to tolerate chronic bacteremia without obvious clinical abnormalities. Eighteen specific-pathogen-free cats were inoculated with Bartonella henselae- and/or Bartonella clarridgeiae-infected cat blood and monitored for 454 days. Relapsing bacteremia did not correlate with changes in protein profiles or differences in antigenic protein recognition. Intradermal skin testing did not induce a delayed type hypersensitivity reaction to cat scratch disease skin test antigen. Thirteen cats were euthanatized at the end of the study. Despite persistent infection, clinical signs were minimal and gross necropsy results were unremarkable. Histopathology revealed peripheral lymph node hyperplasia (in all of the 13 cats), splenic follicular hyperplasia (in 9 cats), lymphocytic cholangitis/pericholangitis (in 9 cats), lymphocytic hepatitis (in 6 cats), lymphoplasmacytic myocarditis (in 8 cats), and interstitial lymphocytic nephritis (in 4 cats). Structures suggestive of Bartonella were visualized in some Warthin-Starry stained sections, and Bartonella DNA was amplified from the lymph node (from 6 of the 13 cats), liver (from 11 cats) heart (from 8 cats), kidney (from 9 cats), lung (from 2 cats), and brain (from 9 cats). This study indicates that B. henselae or B. clarridgeiae can induce chronic infection following blood transfusion in specific-pathogen-free cats and that Bartonella DNA can be detected in blood, brain, lymph node, myocardium, liver, and kidney tissues of both blood culture-positive cats and blood culture-negative cats. Detection of histologic changes in these cats supports a potential etiologic role for Bartonella species in several idiopathic disease processes in cats.

* Corresponding author. Mailing address: North Carolina State University, College of Veterinary Medicine, 4700 Hillsborough St., Raleigh, NC 27606. Phone: (919) 513-6234. Fax: (919) 513-6336.

Journal of Clinical Microbiology, May 1999, p. 1536-1547, Vol. 37, No. 5
0095-1137/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.


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