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 Understanding Flu
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Flu (Influenza)

Understanding Flu

Learn the basics about Flu (Influenza) from causes to complications. NIAID also offers general publications, Spanish language information, and other fact sheets to order or to download and print.

Flu virus illustration

Flu virus
Credit: NIAID

Definitions and Overview

Cause

Transmission

Symptoms

Complications

Diagnosis

Treatment

Prevention

General Publications


Related Links

  • View a list of links for more information about influenza.
  • Influenza news releases
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    Related Links

  • View a list of links for more information about influenza.
  • Influenza news releases