|Mycobacterium shottsii & M. pseudoshottsii
Phylum Actinobacteria, Class Actinobacteria, Order Actinomycetales, Suborder Corynebacterineae, Family Mycobacteriaceae, Genus
- Mycobacterium shottsii Rhodes et al. 2003.
- Mycobacterium pseudoshottsii Rhodes et al. 2005
Acid-fast coccoid cells, 0.8-1 x 0.4-0.6 μm. May form cell aggregates.
Visible growth is observed from dilute inocula after incubation at 23 ºC for 4-6 weeks.
Little or no growth occurs at 30 ºC and none occurs at 37 ºC or more. Colonies on
Middlebrook 7H10 agar are1-3 mm, dysgonic, rough, non-pigmented, and typically flat
with an irregular margin, becoming umbonate on ageing. Smooth colonies with an
entire margin are seen less frequently. No growth on media containing 5% (w/v) NaCl
or on MacConkey agar without crystal violet.
M. pseudoshottsii develops a pale yellow to gold pigment following exposure to light
and intensifies with age.
Isolated from Morone saxatilis (striped bass) during an epizootic of mycobacteriosis in Chesapeake Bay, Maryland, USA.
Susceptible to hydroxylamine (500 µg/ml). Resistant to isoniazid (1 µg/ml) and thiophen-2-carbonic acid hydrazide (10 µg/ml).
Can determine granulomatous lesions in striped bass.
- John G. Magee and Alan C. Ward 2012. Family III. Mycobacteriaceae Chester 1897, 63AL in Bergey’s Manual of Systematic
Bacteriology, Volume Five The Actinobacteria, Part A, Michael Goodfellow & al. (editors), 312-375.
- Rhodes MW, Kator H, McNabb A, Deshayes C, Reyrat JM, Brown-Elliott BA, Wallace RJ, Trott KA, Parker JM, Lifland B, et al.
Mycobacterium pseudoshottsii sp. nov., a slowly growing chromogenic species isolated from Chesapeake Bay striped bass
(Morone saxatilis). Int J Syst Evol Microbiol 2005; 55:1139-1147.
- Rhodes MW, Kator H, Kotob S, van Berkum P, Kaattari I, Vogelbein W, Quinn F, Floyd MM, Butler WR, Ottinger CA. Mycobacterium
shottsii sp. nov., a slowly growing species isolated from Chesapeake Bay striped bass (Morone saxatilis). Int J Syst Evol Microbiol
Positive results for niacin accumulation, and urease.
Negative results for arylsulfatase (3 and 14 days), catalase (semi-quantitative), beta-galactosidase, nitrate reduction, pyrazinamidase
(7 days), and Tween 80 hydrolysis.
Variable results for acid phosphatase, and thermotolerant catalase (68 ºC).
(c) Costin Stoica