What is the incidence of pneumonia in the US?

Updated: Sep 30, 2020
  • Author: Justina Gamache, MD; Chief Editor: Guy W Soo Hoo, MD, MPH  more...
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More than three million cases occur annually in the United States. Pneumonia is more prevalent during the winter months and in colder climates. This condition is most likely from viral upper and lower respiratory infections, which increase in winter and result in impaired host defenses to bacterial superinfection.

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