Unlikely but...: A single episode of pneumonia is usually caused by an infection especially by the bacteria pneumococcus, multiple viruses or atypical pneumonia caused by mycoplasma (walking pneumonia). A person with recurrent pneumonia should be checked for abpa (aspergillus mold) that goes along with allergy and asthma.
Answered 1/18/2020
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Many causes: The allergic inflammation of the airway may lead to easier entry of infectious causes into the airway leading to pneumonia. There are many causes of pneumonia and a sputum sample is advised.
Answered 1/18/2020
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