113lecture3306

113lecture3306 - BIOLOGY 113 - MICROBIOLOGY Lecture 33:...

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BIOLOGY 113 - MICROBIOLOGY Lecture 33: Microbial Diseases of the Upper Respiratory Tract Because many microorganisms, especially viruses, may be airborne, many enter the body via the respiratory system; in fact, respiratory system infections are the most common type of infectious disease - Some of the pathogens that enter through the respiratory system, such as the viruses of measles, mumps and rubella, infect other organs - Others, such as influenza and pneumonococcal pneumonia, target the respiratory system itself - It is convenient to divide the respiratory system into the upper respiratory system , consisting of the nose, throat, middle ear, and sinuses, and lower respiratory tract , consisting of larynx, trachea, bronchial tubes, alveoli, and pleura Note: Tortora et al. use the terms "respiratory system", "upper respiratory system" and "lower respiratory system"; from habit, I usually use the the terms "respiratory tract", "upper respiratory tract (URT)" and "lower respiratory tract (LRT)"; these are interchangable - One important distinction between the upper and lower respiratory systems is that parts of the upper respiratory system possess a normal flora, while the entire lower respiratory system is sterile in the absence of infectious disease - The upper respiratory system serves as home to a number of potentially pathogenic bacteria, including Haemophilus influenzae, Nesseria meningitidis, and Streptococcus pneumoniae, which we have previously encountered as agents of bacterial meningitis; usually, these are held in
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113lecture3306 - BIOLOGY 113 - MICROBIOLOGY Lecture 33:...

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