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Flu
 Understanding Flu
  Definitions and Overview
  Cause
  Transmission
  Symptoms
  Complications
  Diagnosis
  Treatment
  Prevention
  Publications
 Research


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

Publications



Volunteer for NIAID-funded clinical studies related to flu on ClinicalTrials.gov.

Related Links

  • View a list of links for more information about influenza.
  • Influenza news releases
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    Volunteer for NIAID-funded clinical studies related to flu on ClinicalTrials.gov.

    Related Links

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