An infection in humans caused by a small gram-negative BACILLUS (Bartonella henselae). The domestic cat is a reservoir for the bacteria, and up to 50 per cent of the cat population may be aﬀected. The disorder manifests itself as a skin lesion 3–10 days after a minor scratch; within two weeks the victim’s lymph glands enlarge and may produce pus. Fever, headache and malaise occur in some patients. Antibiotics do not seem to be eﬀective. The skin lesion and lymph-gland enlargement subside spontaneously within 2–5 months.
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