Centers for Disease Control (CDC)
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CDC Centers for Disease Control and Prevention About COVID -19
Similarities and Differences Between Flu and COVID-19
Flu and COVID-19 are both contagious respiratory illnesses, but they are caused by different viruses. Because some of the symptoms of flu and COVID-19 are similar, it may be hard to tell the difference between them based on symptoms alone, and testing may be needed to help confirm a diagnosis. Flu and COVID-19 share many characteristics, but there are some key differences between the two.