What is the main cause of pneumonia?

Related questions

1. Is yellow mucus worse than Green?
2. Is it bad to swallow phlegm?
3. Can a chest infection go away on its own?
4. Can you poop out phlegm?
5. How long does pneumonia last untreated?
6. Is milk good for pneumonia?
7. What does GREY phlegm mean?
8. Can you drink milk with pneumonia?
9. Can u die from pneumonia?
10. What happens if you let a sinus infection go untreated?

Tags

1. #infections
2. #causes
3. #streptococcus
4. #other
5. #caused
6. #disease
7. #viral
8. #inflammation
9. #lungs
10. #commonly
11. #pneumonia
12. #infection
13. #characterized
14. #airspaces
15. #bacterial
16. #fungi
17. #common
18. #pneumoniae
19. #frequently