What Is Pneumonia?

(CNN)Pneumonia is a respiratory infection that affects the lungs, resulting in inflammation of the alveoli, the air sacs that make up the bulk of the lungs and help us breathe. Infection causes alveoli to fill with fluid or mucus, limiting the amount of ...

Source : http://www.cnn.com/2016/09/12/health/what-is-pneumonia/index.html

Filed Under: CNN