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What Causes Bronchitis
Bronchitis is generally caused by infection with a virus. However, bronchitis may also be caused by bacteria, smoking or the inhalation of chemical pollutants or dust. The most usual viruses that cause bronchitis are influenza A and B, The most usual bacteria that causes bronchitis is Mycoplasma pneumoniae.
When the cells of the bronchial-lining tissue are irritated beyond a certain point, the tiny hairs (cilia) within them, which normally trap and eliminate pollutants, stop functioning. Consequently, the air passages become clogged by debris and irritation increases. In response, a heavy secretion of mucus develops, which causes the characteristic cough of bronchitis.
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