2025 Flu Symptoms And Duration 2025. Symptoms of influenza usually begin around 2 days after being infected by someone who has the virus. If you have flu symptoms, or have been diagnosed with influenza, it is important to stay home and avoid contact with others until your symptoms have gone.
If you get rsv, on the other hand, it may take 4 to 6 days before symptoms show. Some have reported unusually severe symptoms, even if they’ve been vaccinated.
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