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Originally Posted by GGG
Is pneumonia contagious?
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"Pneumonia" is something of a catch-all term for inflammation of the alveoli in the lung.
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Pneumonia is usually caused by infection with viruses or bacteria and less commonly by other microorganisms, certain medications and conditions such as autoimmune diseases.
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-Wikipedia.
So there are infectious and non-infectious forms of it.
The primary causal agent is
Streptococcus pneumoniae which is a normal resident of the human respiratory tract, but can become pathogenic if the immune system of the host is suppressed in some way.