Sepsis (a life-threatening illness caused by the body’s extreme response to an infection).Acute respiratory distress syndrome (fluid in the lungs).The virus that causes COVID-19 can be spread to others by people before they begin showing symptoms, by people with very mild symptoms, and by people who never experience symptoms (asymptomatic people).īoth COVID-19 and flu can result in complications, including: This means the virus that causes COVID-19 can quickly and easily spread to a lot of people and result in continual spreading among people as time progresses. Also, COVID-19 has been observed to have more superspreading events than flu. While the virus that causes COVID-19 and flu viruses are thought to spread in similar ways, the virus that causes COVID-19 is generally more contagious than flu viruses. Most spread is by inhalation of large and small droplets however, it may be possible that a person can get infected by touching another person (for example, shaking hands with someone who has the virus on their hands), or by touching a surface or object that has virus on it, and then touching their own mouth, nose, or eyes. In some circumstances, such as indoor settings with poor ventilation, small particles containing virus might be spread longer distances and cause infections. These particles can land in the mouths or noses of people who are nearby and possibly be inhaled into the respiratory tract. Both are spread mainly by large and small particles containing virus that are expelled when people with the illness (COVID-19 or flu) cough, sneeze, or talk. This page compares COVID-19 and flu, given the best available information to date.īoth COVID-19 and flu can spread from person to person between people who are near or in close contact with one another. We are learning more everyday about COVID-19 and the virus that causes it. Additionally, some people with COVID-19 may also be affected by post-COVID conditions (also known as long COVID).
People with flu and COVID-19 at the same time can have more severe disease than people with either flu or COVID-19 alone. Testing can also reveal if someone has both flu and COVID-19 at the same time, although this is uncommon. Getting treated early for COVID-19 and flu can reduce your risk of getting very sick.
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Having a medical professional administer a specific test that detects both flu and COVID-19 allows you to get diagnosed and treated for the specific virus you have more quickly. Specific testing is needed to tell what the illness is and to confirm a diagnosis. You cannot tell the difference between flu and COVID-19 by the symptoms alone because they have some of the same signs and symptoms. Compared to people with flu, people infected with COVID-19 may take longer to show symptoms and may be contagious for longer periods of time. More information is available about COVID-19 vaccines and how well they work.Ĭompared with flu, COVID-19 can cause more severe illness in some people. 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.
Flu is caused by infection with a flu virus ( influenza viruses ).įrom what we know, COVID-19 spreads more easily than flu. COVID-19 is caused by infection with a coronavirus (SARS-CoV-2) first identified in 2019. Influenza (flu) and COVID-19 are both contagious respiratory illnesses, but they are caused by different viruses. What is the difference between Influenza (Flu) and COVID-19?
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