10 Pneumonia Causes
9. Bacteria
Bacteria other than mycoplasma can also cause pneumonia, and the most common culprit in many parts of the world is streptococcus pneumoniae. This type of bacterium is the most common cause of community-acquired pneumonia. It will often be found in the respiratory tract but it will not usually cause any harm.
The condition will often occur after the patient has had even mild disease like the cold or the flu, but it can also appear with no connection to any other disease. The bacterium will sometimes cause lobar pneumonia, which is an infection of a particular part of the lungs.
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