Mycobacterium malmoense sp. nov.

Abstract
Strains of a new type of group III nonphotochromogenic mycobacteria were repeatedly isolated from 4 patients with clinical and roentgenological signs of lung mycobacteriosis. These strains split nicotinamide and pyrazinamide as do those of M. avium, but they show no esterase activity. The strains produce thermolabile catalase and hydrolyze Tween 80. They also have a unique lipid pattern and special sensitins and agglutinins. These strains, therefore, are considered as belonging to a new species of pathogenic, nonphotochromogenic mycobacteria, for which the name M. malmoense is proposed. Strain M-o 816 is the type strain, and it was deposited in the American Type Culture Collection under the number 29571.