What causes the development of bacterial pneumonia?

Updated: Sep 30, 2020
  • Author: Justina Gamache, MD; Chief Editor: Guy W Soo Hoo, MD, MPH  more...
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The causes for the development of pneumonia are extrinsic or intrinsic, and various bacterial causes are noted. Extrinsic factors include exposure to a causative agent, exposure to pulmonary irritants, or direct pulmonary injury. Intrinsic factors are related to the host. Loss of protective upper airway reflexes allows aspiration of contents from the upper airways into the lung. Various causes for this loss include altered mental status due to intoxication and other metabolic states and neurologic causes, such as stroke and endotracheal intubation.

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