 [ Symptoms ] is an pneumonia contagious if it is how long is the incubation period  my roommate had an pneumonia a week ago and now me and my other roommate are both getting sick we both have a cough and i have weezing when i breathe deep and a mild fever i also have a headache but i was wondering if we could have gotten something from our roommate [ Disease ] pneumonia itself is not contagious in other words exposure to someone with pneumonia will not necessarily cause pneumonia in you but that does not mean you can not get sick pneumonia can be caused by hundreds of different viruses bacteria and even fungi it is the organismpathogen that may be contagious not the end disease caused by that pathogen like pneumonia