What are the most common causes of pneumonia?
There are many causes of pneumonia, but viruses, once again, are probably the most common. followed by bacteria. There are dozens and dozens of different bacteria that will cause pneumonia, and literally hundreds of different viruses. Then the fungi are in there also. So that these organisms are everywhere around us and it’s hard to predict and hard to understand why, all of the sudden, one of these viruses or one of these bacteria will attack us and cause pneumonia. But they’re always out there and they’re always a problem.