Cat-scratch disease is an infectious disease caused primarily by the bacillus Bartonella henselae. Its manifestations can include self-limited regional lymphadenopathy, fever of unknown origin, and visceral organ, neurologic, and ocular involvement. In immunocompromised patients, cat-scratch disease can cause life-threatening systemic disease. This infection generally occurs in young immunocompetent individuals who have been scratched or bitten by a cat; it can also be caused by a flea bite.
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