Pneumonia is a serious infection that affects the lungs. Most cases (70% to 80%) are acquired in the community, not in a hospital or nursing home, and develop in people over age 60 or in people who have an underlying medical condition.1
This topic focuses on pneumonia that is acquired in the community, not in a health care setting.
Pneumonia can develop in healthy younger people during the winter months, causing a mild illness with recovery in 2 to 3 weeks. Pneumonia also may occur after a viral respiratoryClick here to see an illustration. illness; in these cases, bacteria may cause the infection, which can be severe. Recovery may take 6 to 8 weeks or longer