Mycobacterium lacus

Mycobacterium lacus

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, nonpigmented and smooth to rough, with a slightly irregular edge. Younger colonies appeared slightly transparent.

Physiology
 * Growth was observed on Löwenstein-Jensen medium at 2 weeks at both 37 and 42 °C and at 3 weeks at 30 °C. At 4 weeks, very little growth was observed at 25 °C, and no growth was observed at 52 °C.

Pathogenesis

 * Causitive agent of bursitis in an immunocompetant individual.

Type Strain
Strain NRCM 00-255 = ATCC BAA-323 = DSM 44577
 * Isolated from synovial tissue from a 68-year-old female with bursitis of her right elbow. Likely exposure was in a lake.