causes One of the most common causes of pneumonia is the bacteria named as Streptococcus pneumoniae. Viruses are one of the main reasons why children below 5 years of age suffer from pneumonia. Viruses that cause pneumonia may also cause cold or flu.Mycoplasma is a type of bacteria that doesn?t have a cell wall around the cell membrane which is why they are usually unaffected by most antibiotics which target cell wall synthesis.People with weakened immune systems or chronic health problems usually develop pneumonia due to fungi..
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