What are the risk factors for influenza-related pneumonia?

Updated: Aug 07, 2020
  • Author: Hien H Nguyen, MD, MS; Chief Editor: Michael Stuart Bronze, MD  more...
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Risks for viral pneumonia involve complex host immune responses and viral virulence. Women in the third trimester of pregnancy are at higher risk, as they are for other complications of influenza A and B. The elderly, especially nursing home patients, and those with cardiovascular disease are usually the groups at highest risk; however, particular influenza strains may target younger persons. For example, in the 1918-1919 epidemic, many young adults died of a pneumonia that some experts believe was caused directly by the virus. [11]

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