Influenza

Period of Contagiousness

You may be able to pass on the flu to someone else before you know you are sick, as well as while you are sick. Most healthy adults may be able to infect others beginning 1 daybefore symptoms develop and up to 5 to 7 daysafterbecoming sick. Some people, especially young children and people with weakened immune systems, might be able to infect others for an even longer time.

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