It is a non tuberculous mycobacteria belonging to the group ‘photochromogens’ and is the causative factor for swimming pool granuloma. It is similar to M.kansasii.

Differentiating features of M.marinum from M.kansasii

• Poor growth at 37C
• nitratase negative
• pyrazinamide hydrolase positive
• L- fucosidase positive

1. Photochromogens
2. Swimming pool granuloma
3. Microbiology – MCQ 6 – A patient in an ICU is on central venous line for the past one week.
4. AIIMS November 2011 – MCQ 80