Dermatologic Manifestations of Mycobacterium Marinum Infection of the Skin
- Author: Joslyn S Kirby, MD; Chief Editor: Dirk M Elston, MD more...
Background
Mycobacterium marinum is an atypical Mycobacterium found in salt water and fresh water. M marinum is the most common atypical Mycobacterium to cause infection in humans. Infection occurs following inoculation of a skin abrasion or puncture and manifests as a localized granuloma or sporotrichotic lymphangitis. Diagnosis and treatment are often delayed because of a lack of suspicion for mycobacterial involvement, ie, versus more common bacterial pathogens. Due to the regular use of tumor necrosis factor (TNF) inhibitors for various conditions and immunosuppressants for transplant recipients, infections with mycobacteria other than tuberculosis (MOTT) are increasing.
Pathophysiology
M marinum infection occurs following trauma to an extremity that is in contact with an aquarium, salt water, or marine animals such as fish or turtles. Exposure to M marinum via swimming pools is rare because most pools are chlorinated.
The pathogen is classified in Runyon group 1 and is a photochromogen, which means it produces yellow pigment when cultured and exposed to light. Culture growth occurs over 7-21 days and is optimal at 25-32°C (77-89.6°F) given the organism is adapted to infect ectotherms, such as fish. When endotherms, such as humans, are infected the infection favors the cooler extremities more than central sites. Systemic infection, usually of an immunocompromised host, has been reported. This indicates that the organism is capable of adapting to grow in conditions closer to 37°C.[1]
After inoculation into the host tissues via an abrasion or other wound, the mycobacteria are phagocytosed by macrophages. Inside the macrophage, they are able to interrupt the formation of the phagolysosome, which would kill the organisms. The mycobacteria then escape the lysosome and can move intracellularly and extracellularly via actin-based motility. This may contribute to cell-to-cell spread.
Tumor necrosis factor (TNF) is important for the immune response against mycobacteria. Studies have demonstrated that in the absence of TNF, macrophages engulf but do not destroy the mycobacteria. Instead, the mycobacteria survive and grow, finally killing the macrophage.[2] The importance of TNF is also supported by a number of reports of infection occurring in patients treated with TNF inhibitors.[3, 4]
Studies have revealed 2 pathophysiologically and genetically (ie, via amplified restriction-based polymorphism analysis) distinct populations of M marinum. One group can infect humans and causes acutely lethal disease in fish, while a second group cannot infect humans and causes chronic progressive disease in fish.
Epidemiology
Frequency
United States
Infections caused by M marinum are uncommon but well described in the literature. The estimated annual incidence is 0.27 cases per 100,000 adult patients. Of the more than 160 cases described, most are case reports of cutaneous infection; some report concomitant osteomyelitis, tenosynovitis, arthritis, and/or disseminated infection. Nosocomial infection has never been described.
International
Infection occurs worldwide, most commonly in individuals with occupational and recreational exposure to fresh or salt water.
Mortality/Morbidity
M marinum skin infection typically remains localized and does not cause significant morbidity in patients who are immunocompetent. Cases reported in patients who are severely immunocompromised have resulted in disseminated infection involving the bone marrow and viscera and may result in death.
Race
No racial predilection is apparent for M marinum skin infection.
Sex
No sexual predilection has been noted for M marinum skin infection.
Age
M marinum infection has been reported in persons of every age group; however, it appears to be rare in the pediatric population.[5]
Kent ML, Watral V, Wu M, Bermudez LE. In vivo and in vitro growth of Mycobacterium marinum at homoeothermic temperatures. FEMS Microbiol Lett. Apr 2006;257(1):69-75. [Medline].
Clay H, Volkman HE, Ramakrishnan L. Tumor necrosis factor signaling mediates resistance to mycobacteria by inhibiting bacterial growth and macrophage death. Immunity. Aug 15 2008;29(2):283-94. [Medline].
Salvana EM, Cooper GS, Salata RA. Mycobacterium other than tuberculosis (MOTT) infection: an emerging disease in infliximab-treated patients. J Infect. Dec 2007;55(6):484-7. [Medline].
Levesque BG, Sandborn WJ. Mycobacterium marinum infection in the setting of antitumor necrosis factor alpha therapy for Crohn's disease. Inflamm Bowel Dis. Jun 2011;17(6):1443-4. [Medline].
Doedens RA, van der Sar AM, Bitter W, Scholvinck EH. Transmission of Mycobacterium marinum from fish to a very young child. Pediatr Infect Dis J. Jan 2008;27(1):81-3. [Medline].
Appelgren P, Farnebo F, Dotevall L, Studahl M, Jonsson B, Petrini B. Late-onset posttraumatic skin and soft-tissue infections caused by rapid-growing mycobacteria in tsunami survivors. Clin Infect Dis. Jul 15 2008;47(2):e11-6. [Medline].
S Breza T Jr, Magro CM. Lichenoid and granulomatous dermatitis associated with atypical mycobacterium infections. J Cutan Pathol. Jul 2006;33(7):512-5. [Medline].
Lam A, Toma W, Schlesinger N. Mycobacterium marinum arthritis mimicking rheumatoid arthritis. J Rheumatol. Apr 2006;33(4):817-9. [Medline].
Gluckman SJ. Mycobacterium marinum. Clin Dermatol. May-Jun 1995;13(3):273-6. [Medline].
Bhambri S, Bhambri A, Del Rosso JQ. Atypical mycobacterial cutaneous infections. Dermatol Clin. Jan 2009;27(1):63-73. [Medline].
Mahaisavariya P, Chaiprasert A, Manonukul J, Khemngern S, Tingtoy N. Detection and identification of Mycobacterium species by polymerase chain reaction (PCR) from paraffin-embedded tissue compare to AFB staining in pathological sections. J Med Assoc Thai. Jan 2005;88(1):108-13. [Medline].
Ho MH, Ho CK, Chong LY. Atypical mycobacterial cutaneous infections in Hong Kong: 10-year retrospective study. Hong Kong Med J. 2006/January;12:21-6.
Nolte O, Haag H, Hafner B. A mutation in the 65,000 Dalton heat shock protein gene, commonly used for molecular identification of non-tuberculous mycobacteria, leads to the misidentification of Mycobacterium malmoense as Mycobacterium marinum. Mol Cell Probes. Aug 2005;19(4):275-7. [Medline].
Lai CC, Tan CK, Lin SH, Liu WL, Liao CH, Huang YT, et al. Diagnostic value of an enzyme-linked immunospot assay for interferon-? in cutaneous tuberculosis. Diagn Microbiol Infect Dis. May 2011;70(1):60-4. [Medline].
Wongworawat MD, Holtom P, Learch TJ, Fedenko A, Stevanovic MV. A prolonged case of Mycobacterium marinum flexor tenosynovitis: radiographic and histological correlation, and review of the literature. Skeletal Radiol. Sep 2003;32(9):542-5. [Medline].
Rybniker J, Kramme S, Small PL. Host range of 14 mycobacteriophages in Mycobacterium ulcerans and seven other mycobacteria including Mycobacterium tuberculosis--application for identification and susceptibility testing. J Med Microbiol. Jan 2006;55:37-42. [Medline].
Travis WD, Travis LB, Roberts GD, Su DW, Weiland LW. The histopathologic spectrum in Mycobacterium marinum infection. Arch Pathol Lab Med. Dec 1985;109(12):1109-13. [Medline].
Rallis E, Koumantaki-Mathioudaki E. Treatment of Mycobacterium marinum cutaneous infections. Expert Opin Pharmacother. Dec 2007;8(17):2965-78. [Medline].
Bhatty MA, Turner DP, Chamberlain ST. Mycobacterium marinum hand infection: case reports and review of literature. Br J Plast Surg. Mar 2000;53(2):161-5. [Medline].
Cummins DL, Delacerda D, Tausk FA. Mycobacterium marinum with different responses to second-generation tetracyclines. Int J Dermatol. Jun 2005;44(6):518-20. [Medline].
Dodiuk-Gad R, Dyachenko P, Ziv M, et al. Nontuberculous mycobacterial infections of the skin: A retrospective study of 25 cases. J Am Acad Dermatol. Sep 2007;57(3):413-20. [Medline].
Parrish N, Luethke R, Dionne K, Carroll K, Riedel S. Case of Mycobacterium marinum infection with unusual patterns of susceptibility to commonly used antibiotics. J Clin Microbiol. May 2011;49(5):2056-8. [Medline].
Janik JP, Bang RH, Palmer CH. Case reports: successful treatment of Mycobacterium marinum infection with minocycline after complication of disease by delayed diagnosis and systemic steroids. J Drugs Dermatol. Sep-Oct 2005;4(5):621-4. [Medline].

