
Flu Symptoms Day by Day: How Long the Flu Lasts & When You’re Contagious
Flu symptoms usually start suddenly 1 to 4 days after exposure, most often around day 2. Fever, chills, body aches and exhaustion are worst in the first 3 days and usually improve by days 5 to 7, but cough and tiredness can last 2 weeks or more. You are most contagious in the first 3 to 4 days. Getting tested in the first 48 hours gives antiviral treatment the best chance to help.
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