Microbiology Lecture Chapter 24- Microbial Diseases of the Respiratory System
Does the URS and LRS have normal microflora?
The URS system does
The most common portal of entry is the
the respiratory system
_________ are localized phagocytic cells in the LRS.
True or false. There are 10,000-100,,000 per cough or sneeze.
Causes of aerosolization of microbes sneezing, coughing, talking etc. Why
water droplets are expelled
evaporate to about 1 -4 um.
-microbes and mucous
Aerosolized microbes are typically from:
soil water plants people
Microbes in the air:
air is not a growth medium
gram (+) is resistant to drying (Strep-Staph, Mycobacterium- waxy cell wall hard to penetrate)
effective transmittal occurs over short distance
Protective mechanisms of the Respiratory system
lungs are housed in a 2 layer sac called the pleura
Normal microflora in URT
Common infections of the URT which are usually caused by staph and strep
Bacterial diseases of URT
Streptococcal pharyngitis (strep throat)
____ and ______ are important respiratory pathogens.
Streptococcus can be found in healthy carriers and negative activities prevented by _________.
Virulent strains of streptococcus are:
sever sore throat, malaise, enlarged tonsils, etc.
Bacteriophage gene----> exotoxin
Diphtheria is caused by
corynebacterium diphtheria and is pleomorphic- changes in different environments
In diphtheria the exotoxin destroys _______.
TB study slides on PPT