EN
Systemic mycobacteriosis was diagnosed in a group of ornamental fish. Although a large number of acid-fast bacterial rods were identified in the kidneys, liver, and muscles of each fish, no granulomas were observed in internal organs. Mycobacterium peregrinim was identified using the GenoType Mycobacterium CM assay. This study illustrates a considerable risk of atypical mycobacteriosis in humans.