On initial assessment in the infectious diseases clinic, the patient was noted to be afebrile with an unremarkable general examination. One of these nodules was incised and drained, but no pus was obtained.ĭue to a lack of response to empirical antibiotics, she was referred to an infectious diseases specialist and was seen seven weeks following onset of the erythema. Over the next six weeks, she was prescribed various courses of oral and intravenous antibiotics by her family physician, as well as emergency room physicians, including cephalexin, cefazolin and clindamycin.ĭespite these treatments, within two weeks the erythema progressed up her right forearm and reddish, purplish nodules had developed on her right third finger as well as her forearm. She subsequently developed erythema of that digit and sought medical attention within several days. We present a case of cutaneous M marinum infection acquired from Artemia nyos (sea monkeys).Ī 43-year-old female homemaker sustained a laceration to the distal phalanx of her right third digit. ![]() Consequently, M marinum, M platypoecilus and M balnei were shown to have the same taxonomical identity and are now all referred to as M marinum (6). Three additional similar cases were reported in 1970 and, thus, the term ‘fish tank granuloma’ was used to describe this infection ( 5). In 1961, a mother and son acquired granulomatous nodules on their hands as a result of M balnei infection following injuries from the metal band lining the top of a tropical fish tank ( 4). In 1954, Mycobacterium balnei was identified as the causative organism ( 3). Through the 1940s and 1950s there were numerous reports of granulomatous skin lesions resulting from abrasion acquired in swimming pools, and this condition became known as ‘swimming-pool granuloma’. ![]() Subsequently, an outbreak among the Mexican platyfish, Platypoecilus maculates, was reported in 1942 and the etiological organism was named Mycobacterium platypoecilus ( 2). These organisms differed from previously known mycobacteria and were given the name Mycobacterium marinum. In 1926, acid-fast bacilli were identified in the tubercles of dead fish in the Philadelphia Aquarium (Pennsylvania, USA) ( 1).
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