W9- Mycobacterium Flashcards
Genus Mycobacterium
Thin
- rod shaped (0.2-0.4 x 2 to 10um)
- non motile
An important property of mycobacterium, which derives from their cell wall structure, is referred to as
Acid fastness
T/F
They grow more slowly than most other human pathogenic bacteria because of their HYDROPHOBIC CELL
TRUE
NotE: They tend to clump, so the nutrients are not easily allowed into the cell.
There are two major groups
M. tuberculosis complex
The organisms that belongs to M. tuberculosis complex are the following:
M. tuberculosis
M. bovis
M. africanum
The organisms that belongs to NON TUBERCULOSIS MYCOBACTERIA or the NTM are the following:
ALL OTHER SPECIESE THAT DO NOT BELONG TO m. tuberculosis complex
Associated to the disease called “Consumption’
- slow grower, and colonies are non pigmented
- the species are all capable of causing tuberculosis
M. tuberculosis complex
What organism is the cause of most cases of human tuberculosis
Mycobacterium tuberculosis
-Distributed WROLDWIDE
What is the mode of transmission for M. tuberculosis?
Inhalation of the single viable organisms
-Distributed WROLDWIDE
What is the mode of transmission for M. bovis?
Ingestion of milk from infected cows penetration into the gastrointestinal mucosa or invade the lymphatic tissue of the oropharynx
What are the common presenting symptoms for tuberculosis?
low grade fever, night sweats, fatigue, anorexia & weight loss
What is the mode of transmission for M. africanum?
Inhalation of droplet nuclei
-Distributed EAST & WEST AFRICA
Nontuberculosis mycobacteria
present in everywhere in the environment
-colonizes healthy individual in the SKIN, RESPIRATORY and GASTROINTESTINAL TRACT
Colonies of NTM that develops pigment following exposure to LIGHT
Photochromogens
Colonies of NTM that develop pigment in the DARK or light
Scotochromogens
