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Why do children get sick so often?

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Children have about five to seven colds per year. A big part of the reason is because they spend time at school or in day-care centers where they're in close contact with other kids most of the day. Also, kids aren't as conscientious about sneezing into the crook of their arm or frequent hand washing -- not to mention keeping their hands to themselves. And to top it off, their young immune systems aren't yet strong enough to fight off colds.

SOURCES: 

National Institute of Allergy and Infectious Diseases: "Common Cold." 

Palo Alto Medical Foundation: "The Common Cold." 

University of Virginia Health System: "Upper Respiratory Infection (URI or Common Cold)." 

National Jewish Medical and Research Center: "Getting Well When You Have a Cold or the Flu." 

Medline Plus: "Common Cold." 

FDA: "Colds and Flu: Time only Sure Cure." 

American Lung Association: "A Survival Guide for Preventing and Treating Influenza and the Common Cold."

UpToDate: "The common cold in adults: Diagnosis and clinical features."

Johns Hopkins Medicine: "Rhinovirus."

Reviewed by Sabrina Felson on March 22, 2017

SOURCES: 

National Institute of Allergy and Infectious Diseases: "Common Cold." 

Palo Alto Medical Foundation: "The Common Cold." 

University of Virginia Health System: "Upper Respiratory Infection (URI or Common Cold)." 

National Jewish Medical and Research Center: "Getting Well When You Have a Cold or the Flu." 

Medline Plus: "Common Cold." 

FDA: "Colds and Flu: Time only Sure Cure." 

American Lung Association: "A Survival Guide for Preventing and Treating Influenza and the Common Cold."

UpToDate: "The common cold in adults: Diagnosis and clinical features."

Johns Hopkins Medicine: "Rhinovirus."

Reviewed by Sabrina Felson on March 22, 2017

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What is "cold season" in the United States?

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