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During the COVID-19 pandemic, you may have heard that coronavirus disease 2019 (COVID-19) is similar to the flu (influenza). COVID-19 and the flu are both contagious respiratory diseases caused by viruses. They have some common symptoms. But through closer comparison, they can affect people differently. Also, since the flu has been around much longer, doctors know more about how to treat and prevent it, while they continue to learn more about COVID-19.