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Pneumonia is a serious infection and inflammation of the lungs.
If you have pneumonia, air sacs in your lungs fill with pus and other liquid, making it difficult for you to breathe. As a result, less oxygen reaches your blood, and your body's cells can't work properly. In severe cases, pneumonia can cause death. Pneumonia is a serious illness. Before the use of antibiotics brought it under control in the 1930's, pneumonia was the number one cause of death in the United States.