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 (SARS-CoV-2) 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 the 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 reducing the risk of severe COVID-19 illness and death. More information is available about the COVID-19 vaccines and how well they work.
Compared with the flu, COVID-19 can cause a more severe illness in some people. Compared to people with the flu, people infected with COVID-19 may take longer to show symptoms and may be contagious for longer periods of time.
You cannot tell the difference between flu and COVID-19 by the symptoms alone because they share some of the same signs and symptoms. Specific testing is needed to determine what the illness is and to confirm a diagnosis. Having a medical professional administer a specific test that detects both flus and COVID-19 allows you to get diagnosed and treated for the specific virus you have more quickly. Getting treated early for COVID-19 and the flu can reduce your risk of getting very sick. Testing can also reveal if someone has both the flu and COVID-19 at the same time, although this is uncommon. People with the flu and COVID-19 at the same time can have more severe diseases than people with either the flu or COVID-19 alone. Additionally, some people with COVID-19 may also be affected by post-COVID conditions (also known as long COVID).
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