It is from the bacteria steptococcus.
steptococcus pneumonae
Pneumonia is a general term, not a specific disease. There is viral pneumonia, bacterial pneumonia, and a fungal pneumonia, among others.
walking pneumonia
There is no opposite of pneumonia.
Bilateral pneumonia.
This type of pneumonia is also called atypical pneumonia, walking pneumonia, or community-acquired pneumonia
You should say, "I recovered from pneumonia."
Multifocal pneumonia means that there are patches of pneumonia throughout your lungs as opposed to lobar pneumonia which is contained in one spot.
Progressive pneumonia is a condition in which pneumonia isn't adequately treated, and has relapsed into a heavier pneumonia, which tends to be harder to treat.
I once had pneumonia.
pneumonoultramicroscopicsilicovolcanoconiosis (pneumonia)