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When am I most contagious when I have the flu?

ANSWER

Some experts believe you're most likely to spread the virus from the first 3 to 4 days. That's because the more you cough and sneeze, the more droplets you shoot into the air and onto objects around you.

From: How Long Is the Flu Contagious? WebMD Medical Reference

SOURCES:

CDC: “How Flu Spreads,” “Flu & You.”

Cowling, B. , published online May 7, 2008. PLOSOne

Halloran, M. , Jan. 15, 2007. American Journal of Epidemiology

Hayward, A. , March 2010. KidsHealth: “Influenza (Flu).” Clinical Infectious Diseases

Medscape: “Influenza Practice Essentials.”

U.S. Department of Health and Human Services Flu.gov: “Interim Guidance on Environmental Management of Pandemic Influenza Virus.”

UK National Health Service NHS Choices: “Flu.”

Reviewed by Melinda Ratini on January 2, 2019

SOURCES:

CDC: “How Flu Spreads,” “Flu & You.”

Cowling, B. , published online May 7, 2008. PLOSOne

Halloran, M. , Jan. 15, 2007. American Journal of Epidemiology

Hayward, A. , March 2010. KidsHealth: “Influenza (Flu).” Clinical Infectious Diseases

Medscape: “Influenza Practice Essentials.”

U.S. Department of Health and Human Services Flu.gov: “Interim Guidance on Environmental Management of Pandemic Influenza Virus.”

UK National Health Service NHS Choices: “Flu.”

Reviewed by Melinda Ratini on January 2, 2019

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Is there any way to tell if my flu is still contagious?

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