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Glimmer

Pneumonia is an infection in one or both of the lungs that primarily affects the tiny air sacs called alveoli. These air sacs become inflamed and can fill with fluid or pus, making it difficult for oxygen to get into the bloodstream.
Causes:
Pneumonia can be caused by various germs, including:
 * Bacteria: The most common cause, with Streptococcus pneumoniae being the most frequent culprit. Bacterial pneumonia can occur on its own or after a viral infection like a cold or the flu