Mycobacterium marinum

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