Laurel Kelly | (TNS) Mayo Clinic News Network Pneumonia causes more than a million hospitalizations and 50,000 deaths per year in the U.S., according to the American Lung Association.Pneumonia is an infection that inflames the air sacs in one or both lungs.The air sacs may fill with fluid or pus, causing cough with phlegm or pus, fever, chills, and difficulty breathing.
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