The most authoritative answer in 2024
-

-
Harper Martinez——Studied at the University of Zurich, Lives in Zurich, Switzerland.
Pneumonia is swelling (inflammation) of the tissue in one or both of the lungs. It's usually caused by an infection -C most commonly, bacteria and viruses, which are both
contagious.
read more >>
About “Pneumonia、contagious、Pneumonia”,people ask:
QuesHub is a place where questions meet answers, it is more authentic than Quora, but you still need to discern the answers provided by the respondents.