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Doctor insights on: When Are Colds And The Flu Most Contagious

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Dr. Heidi Fowler
1,889 doctors shared insights

Flu (Definition)

The flu, otherwise known as influenza, is a viral infection of the nose and throat. Symptoms of influenza include fever, chills, runny nose, muscle aches, fatigue, malaise, headaches, and coughing. Children with the flu often have nausea and vomiting as well. Some strains of the flu are preventable by getting a yearly flu ...Read more


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Are you stil contagious after 24 hours of having the flu or cold?

Are you stil contagious after 24 hours of having the flu or cold?

Yes: After having 24 hours of cold or flu symptoms, a person is still quite contagious. It is hard to tell when a person is not contagious, because that varies from case to case, and because the viruses decrease over a few days (they don't all die at exactly one moment in time). The safer thing to do is to avoid spreading viruses by touching others, or by sneezing or coughing on others, for a week. ...Read more

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How long is the common cold contagious for? The same applies for the flu and other common infections?

How long is the common cold contagious for? The same applies for the flu and other common infections?

Variable: You are most contagious for a few days before you peak symptoms start for the flu you are also contagious for several days after you become smptomaic. ...Read more

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My daughter has had the flu for a week now. Been on Tamiflu (oseltamivir) for 3 days. Temp normal since last night. Still has cold symptoms. She still contagious?

My daughter has had the flu for a week now. Been on Tamiflu (oseltamivir) for 3 days. Temp normal since last night. Still has cold symptoms. She still contagious?

Influenza: usually when the fever is gone then you are not infectious any longer. However, that does not mean that she is ready for school. After being ill for over a week she need time to recuperate and get her strength back. ...Read more

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For how long is the flu contagious on surfaces?

For how long is the flu contagious on surfaces?

About 24 hours: The virus last about 4 hours on solid surfaces and at best about 24 hours. See this site for more info. http://www.cdc.gov/flu/about/qa/disease.htm. ...Read more

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I'm curious as to how long is the flu contagious for?

I'm curious as to how long is the flu contagious for?

Influenza: According to the cdc: “most healthy adults may be able to infect others beginning 1 day before symptoms develop and up to 5 to 7 days after becoming sick. Children may pass the virus for longer than 7 days.”. ...Read more

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When does the flu stop being contagious ? After hoe many days from symptoms resolving ?

When does the flu stop being contagious ? After hoe many days from symptoms resolving ?

About 7 days: According to the CDC usually you can spread flu about 7 days after you start experiencing symptoms. Longer if you are a child. The CDC does not give the number of day after resolving from the flu. So I would say that if you no longer have the flu and it has been 7 days since the start of the symptoms, you are likely no longer contagious. ...Read more

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Would you be still contagious, if you are getting over the flu and have lingering symptoms?

Flu Contagious.: On average, most people are contagious from one day prior to the onset of symptoms until about 7 days later. ...Read more

Contagious (Definition)

One is able to transmit an infection to another by ...Read more