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MYCOBACTERIUM : Mycobacterium marinum causes disease in many fish species from cold or warm, fresh or salted water, human infection follows contact with fishes or contaminated water. First described as "swimming-pool granuloma,"marinum skin infection is often acquired from aquarium maintenance and called "fish tank granuloma."The infection is commonly limited to a skin disease on the limbs but can spread to deeper structures, resulting in tenosynovitis, arthritis, and osteomyelitis. Disseminated infections are exceptional. The incidence of M marinum infection in humans is underestimated, but rates of up to 0.27 case per 100 000 inhabitants have been observed.
Surgery, antibiotherapy, and cryotherapy have been recommended for the treatment of M marinum infections, but none of these treatments has proved to be superior to another.
first isolated from dead fish in a Philadelphia aquarium in 1926 [1] and was identified as a human pathogen in 1951 after isolation from granulomatous skin lesions in patients from Sweden.