Pneumonia is an inflammation of the alveoli. It can be cause by a virus, mycoplasmal agents, bacteria, or the foreign substances aspiration. The causative agents are usually come to the lung through inhalation or from the bloodstream.
There are types of pneumonia:
- Viral pneumonia
- Primary atypical pneumonia (Mycoplasma pneumonia)
- Bacterial pneumonia
- Aspiration pneumonia
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