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What is the difference between Influenza (Flu) and COVID-19?

Influenza (flu) and COVID-19 are both contagious respiratory illnesses, but they are caused by different viruses. COVID-19 is caused by infection with a coronavirus first identified in 2019. Flu is caused by infection with a flu virus (influenza viruses).

From what we know, COVID-19 spreads more easily than flu. Efforts to maximize the proportion of people in the United States who are up to date with their COVID-19 vaccines remain critical to ending the COVID-19 pandemic. More information is available about COVID-19 vaccines and how well they work.

Compared to flu, COVID-19 can cause more serious illnesses in some people. COVID-19 can also take longer before people show symptoms, and people can remain contagious for longer periods of time. More information about differences between flu and COVID-19 is available in the different sections below.

You cannot tell the difference between flu and COVID-19 just by looking at the symptoms alone because they have some of the same symptoms. That’s why testing is needed to tell what the illness is and to confirm a diagnosis. Testing is also important because it can reveal if someone has both the flu and COVID-19 at the same time.

While more is learned every day about COVID-19 and the virus that causes it, there are still things, such as post-COVID conditions (also known as long COVID), that are unknown. This page compares COVID-19 and flu, given the best available information to date.

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