Mycobacterium marinum was isolated for the first time in Denmark from skin granuloma of a 37-year-old man. The skin lesion was provoked by an injury from the broken glass of an aquarium used for tropical fish. Treatment with rifampicin and ethambutol was successful. At the time of diagnosis, M. marinum was also isolated from a dead fish; but in no case was skin granuloma found among purchasers of fish supplied by the patient.
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