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Why is the flu more common in the winter?

ANSWER

Many things play a role in making the flu more common in the winter:

  • The virus lives longer indoors in winter, because the air is less humid than outside.
  • While it's alive and in the air, it's easy for people to inhale it, or for it to land on the eyes, nose, or mouth.
  • We spend more time indoors and have closer contact with each other, which makes it easier for the virus to spread.

From: What Causes the Flu? WebMD Medical Reference

SOURCES:

CDC: "Estimating Seasonal Influenza-Associated Deaths in the United States: CDC Study Confirms Variability of Flu" and "The Influenza (Flu) Viruses." National Institute of Allergy and Infectious Diseases: "Flu (Influenza): Causes." Asthma and Allergy Foundation of America: "Flu (Influenza)." FDA: "The Flu." American Lung Association: "Cold and Flu Guidelines: Influenza."  




Reviewed by Carol DerSarkissian on July 21, 2017

SOURCES:

CDC: "Estimating Seasonal Influenza-Associated Deaths in the United States: CDC Study Confirms Variability of Flu" and "The Influenza (Flu) Viruses." National Institute of Allergy and Infectious Diseases: "Flu (Influenza): Causes." Asthma and Allergy Foundation of America: "Flu (Influenza)." FDA: "The Flu." American Lung Association: "Cold and Flu Guidelines: Influenza."  




Reviewed by Carol DerSarkissian on July 21, 2017

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How long am I contagious if I have the flu?

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