Bartonella clarridgeiae has been isolated from persistently infected cats, and in 1997, CSD in a veterinarian was associated with B. clarridgeiae rather than B. henselae infection.

• The organism was cultured from a 6-week-old cat the veterinarian had adopted.

Independently, co-infection of cats with B. clarridgeiae and B. henselae has been demonstrated serologically in France.

• The involvement of B. clarridgeiae or antigenic variants of B. henselae in CSD may explain why a portion of human CSD patients can remain seronegative to B. henselae.

Bartonella clarridgeiae has also been isolated from dogs with valvular endocarditis and granulomatous hepatitis.

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