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An infectious disease caused by a Mycobacterium which can be transmitted by animals, including fish, to humans. In humans the disease is characterised by inflamed, irritated, or otherwise damaged skin, usually around the fingers, hands, and forearms to varying degrees. The disease is often given the name 'fish keeper's granuloma' or in the hobby is sometimes referred to as 'fish keeper's fingers'. The disease is not serious but can be unsightly and irritating, and requires treatment with antibiotics.

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