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A 23-year-old male asked:

How long is someone contagious for when they have the common cold, flu, or bacterial / viral bronchitis?

1 doctor answer1 doctor weighed in
Dr. Raja Abusharr
Family Medicine 22 years experience
Contagious periods: The contagious period differs for each type of infection, even among different viruses! there is a range of values based on different infections ranging from common cold to influenza. These vary from 24 hours to up to 2 weeks! you should ask your physician what infection you have and for how long you will be contagious. Common sense dictates that respiratory viruses travel by cough or sneeze.

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Last updated Feb 5, 2021

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