Each lung has an apex, base, 2 surfaces (costal
and medial) and 3 borders (anterior, posterior
& inferior).
brief introduction
M. tuberculosis is part of a complex that has at least 9 members: M.
tuberculosis sensu stricto, M. africanum, M. canetti, M. bovis, M. caprae, M.
microti, M. pinnipedii, M. mungi, and M. orygis
It requires oxygen to grow, does not produce spores, and is nonmotile.[8][9] M.
tuberculosis divides every 15–20 hours. This is extremely slow compared with
other bacteria, which tend to have division times measured in minutes
It is a small bacillus that can withstand weak disinfectants and can survive in a dry
state for weeks. Its unusual cell wall is rich in lipids such as mycolic acid and is
likely responsible for its resistance to desiccation and is a key virulence factor
the mycolic acid in the cell wall of M. tuberculosis does not absorb the stain.
Instead, acid-fast stains such as Ziehl-Neelsen stain, or fluorescent stains
commonly used media include liquids such as Middlebrook 7H9 or 7H12, egg-based
solid media such as Lowenstein-Jensen
clubbing causes
copd, lung cancer, ulcerative colitis, bronchiectasis, infective endocarditis, GI distress
mode of transmission
Indirect contact
When you touch a doorknob handled by someone ill with the flu or a cold, for example.
Insect bites
Some germs rely on insect carriers — such as mosquitoes, fleas, lice or ticks.
Food Contamination
such as undercooked hamburger or unpasteurized fruit juice.
droplet
Transmission occurs when droplets containing microorganisms generated
during coughing, sneezing and talking are propelled through the air.
Airborne
Microoganisms carried in this manner remain suspended in the air for
long periods of time and can be dispersed widely by air currents. Because
of this, there is risk that all the air in a room may be contaminated