Mycobacterium lacus
Scientific classification
Domain:	Bacteria
Phylum:	Actinomycetota
Class:	Actinomycetia
Order:	Mycobacteriales
Family:	Mycobacteriaceae
Genus:	Mycobacterium
Species:	M. lacus
Binomial name
Mycobacterium lacus Turenne et al. 2002, ATCC BAA-323

Mycobacterium lacus is a species of bacteria in the genus Mycobacterium known to be a causative agent in immunocompetent individuals.

Description

Large, dispersed acid-fast bacilli with prominent beading

Colony characteristics

• Colonies on Löwenstein–Jensen medium were nonchromogenic, small, with a dry appearance.
• On Middlebrook 7H10 agar, colonies are small, non-pigmented and smooth to rough, with a slightly irregular edge. Younger colonies appeared slightly transparent.

Physiology

• Growth was observed on Löwenstein–Jensen medium at two weeks at both 37 and 42 °C and at 3 weeks at 30 °C. At four weeks, very little growth was observed at 25 °C, and no growth was observed at 52 °C.

Pathogenesis

• The causative agent of bursitis in an immunocompetent individual.

Type strain

• Isolated from synovial tissue from a 68-year-old female with bursitis of her right elbow. The likely exposure was in a lake.

Strain NRCM 00-255 = ATCC BAA-323 = DSM 44577