Flu Symptoms 2024 How Long Does It Last In Canada. 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. If you have symptoms of long flu, including shortness of breath and a lingering cough, and they last for more than two.
Everything you need to know about the flu illness, including symptoms, treatment and prevention. Influenza largely disappeared until early 2022.
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