-
Mycobacterium tuberculosis Mycobacterium bovis Eugonic,
rough tough and buff
Dysgonic Aerobic Microaerophillic Glycerol enhancement +
Glycerol enhancement -...
- the organism, so they
applied the name CDC
group DF-2. DF-2
stands for
dysgonic fermenter,
meaning that the
bacterium is a slow-growing,
fermentative bacillus...
- hyphae.
Colony characteristics Tiny, transparent,
nonphotochromogenic and
dysgonic colonies (on
solid Middlebrook 7H11
medium MJ (Allied Laboratories). Physiology...
- acid-fast rods (0.6-1.0 μm x 0.7-2.0 μm).
Filaments (up to 6.0 μm) possible.
Dysgonic,
smooth and
scotochromogenic colonies (1–2 mm in diameter). Slow growth...
- Gram-positive, nonmotile, acid-fast,
coccoid rods.
Colony characteristics Dysgonic and
yellow photochromogenic (pigment not
produced in the dark) colonies...
-
Colonies on Löwenstein-Jensen
media and on
Middlebrook 7H11 agar are small,
dysgonic and scotochromogenic, and
produce yellow pigment.
Physiology Visible growth...
- pyruvate-containing
media under low
oxygen conditions, and
forms characteristic "
dysgonic" colonies.
Unlike M. tuberculosis, M.
africanum shows catalase activity...
- Does not form spores,
capsules or
aerial hyphae.
Colony characteristics Dysgonic and nonphotochromogenic, pale
yellow colonies on Löwenstein-Jensen agar...
- very similar, but can be
distinguished by its
growth at 22 °C, and by its
dysgonic growth.
Pulmonary disease Biosafety level 2
Repeatedly isolated from sputum...
