Mycobacterium marinum is an atypical Mycobacterium species found in cold or warm, fresh or salted water. M marinum infection occurs following skin and soft-tissue injuries that are exposed to an aquatic environment or marine animals. The infection usually presents as a localized granuloma but can evolve into an ascending lymphangitis that resembles sporotrichosis or can spread to deeper tissues. M marinum is a pathogen classified in Runyon group 1 and is a photochromogen, meaning it produces pigment when cultured and exposed to light. Culture growth occurs over 7-14 days and is optimal at 32°C (Medscape - Mycobacterium marinum).
Efficacy:
Fish receiving the DNA vaccine developed a protective response to a live M. marinum challenge 90 days post-inoculation, as demonstrated by increased survival of vaccinated fish over control fish and by reduced splenic bacterial counts in vaccinated fish (Pasnik and Smith, 2005).
2. Pasnik and Smith, 2005: Pasnik DJ, Smith SA. Immunogenic and protective effects of a DNA vaccine for Mycobacterium marinum in fish. Veterinary immunology and immunopathology. 2005; 103(3-4); 195-206. [PubMed: 15621306].