[Rabbit fever--a neck tumor].

Twenty-two-year-old previously healthy male is referred to the ENT clinic with a neck tumour. The patient was an animal caretaker. Ultrasonic examination showed a lymph gland conglomerate on the left side of the neck. Primary serologic examination was negative and the lymph tumour was removed. The biopsy showed necrotic lymphadenitis. Three weeks after the first consultation the patient tests positive for F. tularensis. The patient was treated with ciprofloxacin 750 mg x 2 by the oral route for two weeks. Seven weeks after the onset of treatment, the titer for F. tularensis lowers.