Mycobacterium duvalii
# Mycobacterium duvalii

Mycobacterium duvalii is a species of the phylum Actinomycetota (Gram-positive bacteria with high guanine and cytosine content, one of the dominant phyla of all bacteria), belonging to the genus Mycobacterium.

## Description

Gram-positive, nonmotile and pleomorphic acid-fast rods.

Colony characteristics

* Bright yellow pigmented, scotochromogenic and rough or smooth colonies on Löwenstein–Jensen medium.

Physiology

* Fast growth on Löwenstein–Jensen medium at 25 °C and 37 °C within 7 days. No growth at 45 °C.
* Resistant to isoniazid, rifampicin, and sodium aminosalicylate.

Differential characteristics

* Characterised by the possession of 6 species-specific antigens demonstrable in immunodiffusion tests.

Pathogenicity.

## Pathogenesis

Not pathogenic, but evidence insufficient. Biosafety level 1.

## Type strain

First isolated from cases of human leprosy by C. W. Duval. Strain ATCC 43910 = CCUG 41352 = CIP 104539 = DSM 44244 = JCM 6396 = NCTC 358.

