How Long Does The Flu Last 2024. 53.9% for children aged 6 months to. Flu symptoms usually appear two to three days after contact with the virus, according to the university of pennsylvania health system, but you may start to feel sick anywhere from one to.
We explain what to expect when you have the flu, how long you’re contagious,. Some people only have mild symptoms for a few days, particularly if they have some immunity from a previous infection or.
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