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並前往https://www.mayoclinic.org/diseases-conditions/coronavirus/in-depth/covid-19-cold-flu-and-allergies-differences/art-20503981

COVID-19, cold, allergies and the flu: What are the differences?

Flu symptoms usually appear about one to four days after exposure to an influenza virus. COVID-19 can cause more-serious illnesses in some people than the flu.

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