Is pneumonia a transmissible disease?

It is an infectious disease. However, you are more apt to get it if you smoke or have otherwise unhealthy lungs.

It's viral, and it's also the smallest virus known to man so far.

Yes. The vast majority of patients recover with properly targeted antibiotic treatment (unless it is a viral pneumonia). There are a few inidividuals, whether elderly, debilitated, or...

strongulosentrosis droebachiensis

There are several diseases much worse than pneumonia. Diseases such as Ebola, H1N1, and Cancer are far less treatable and far less surviable, in most cases, then pneumonia. However, this is somewhat...