Influenza and COVID-19

NİLUFƏR MƏMMƏDOVA

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, and flu is caused by infection with influenza viruses.

COVID-19 seems to spread more easily than flu. However, as more people become fully vaccinated against COVID-19, the spread of the virus that causes COVID-19 should slow down. 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 be contagious for longer. More information about differences between flu and COVID-19 is available in the different sections below.

Because some of the symptoms of flu, COVID-19, and other respiratory illnesses are similar, the difference between them cannot be made based on symptoms alone. Testing is needed to tell what the illness is and to confirm a diagnosis. People can be infected with both flu and the virus that causes COVID-19 at the same time and have symptoms of both influenza and COVID-19.

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

 

Signs and Symptoms

Similarities:

Both COVID-19 and flu can have varying degrees of signs and symptoms, ranging from no symptoms (asymptomatic) to severe symptoms. Common symptoms that COVID-19 and flu share include:

Fever or feeling feverish/having chills

Cough

Shortness of breath or difficulty breathing

Fatigue (tiredness)

Sore throat

Runny or stuffy nose

Muscle pain or body aches

Headache

Vomiting and diarrhea

Change in or loss of taste or smell, although this is more frequent with COVID-19.

 

How Long Symptoms Appear After Exposure and Infection

Similarities:

For both COVID-19 and flu, 1 or more days can pass between when a person becomes infected and when he or she starts to experience illness symptoms.

Differences:

If a person has COVID-19, it could take them longer to experience symptoms than if they had flu.

Flu

Typically, a person experiences symptoms anywhere from 1 to 4 days after infection.

COVID-19

Typically, a person experiences symptoms about 5 days after being infected, but symptoms can appear 2 to 14 days after infection.

 

How Long Someone Can Spread the Virus

Similarities:

For both COVID-19 and flu, it’s possible to spread the virus for at least 1 day before experiencing any symptoms.

Differences:

If a person has COVID-19, they could be contagious for a longer time than if they had flu.

Flu

Most people with flu are contagious for about 1 day before they show symptoms.

Older children and adults with flu appear to be most contagious during the initial 3-4 days of their illness but many people remain contagious for about 7 days.

Infants and people with weakened immune systems can be contagious for even longer.

 

COVID-19

How long someone can spread the virus that causes COVID-19 is still under investigation.

It’s possible for people to spread the virus for about 2 days before experiencing signs or symptoms (or possibly earlier) and remain contagious for at least 10 days after signs or symptoms first appeared. If someone is asymptomatic or their symptoms go away, it’s possible to remain contagious for at least 10 days after testing positive for COVID-19. People who are hospitalized with severe disease and people with weakened immune systems can be contagious for 20 days or longer.

How it Spreads

Similarities:

Both COVID-19 and flu can spread from person-to-person between people who are in close contact with one another (within about 6 feet). 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. These particles can land in the mouths or noses of people who are nearby and possibly be inhaled into the lungs. In some circumstances, such as indoor settings with poor ventilation, small particles might be spread further than 6 feet and cause infections.

Although most spread is by inhalation, it may be possible that a person can get infected by touching (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.

Both flu viruses and 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).

Differences:

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. Also, COVID-19 has been observed to have more superspreading events than flu. 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.

 

People at Higher-Risk for Severe Illness

Similarities:

Both COVID-19 and flu illness can result in severe illness and complications. Those at highest risk include:

Older adults

People with certain underlying medical conditions (including infants and children)

Pregnant people

Differences:

Overall, COVID-19 seems to cause more serious illnesses in some people.

Serious COVID-19 illness resulting in hospitalization and death can occur even in healthy people.

 

Complications

Similarities:

Both COVID-19 and flu can result in complications, including:

Pneumonia

Respiratory failure

Acute respiratory distress syndrome (fluid in the lungs)

Sepsis (a life-threatening illness caused by the body’s extreme response to an infection)

Cardiac injury (for example, heart attacks and stroke)

Multiple-organ failure (respiratory failure, kidney failure, shock)

Worsening of chronic medical conditions (involving the lungs, heart, or nervous system or diabetes)

Inflammation of the heart, brain, or muscle tissues

Secondary infections (bacterial or fungal infections that can occur in people who have already been infected with flu or COVID-19)

 

Differences:

Flu

Most people who get flu will recover on their own in a few days to two weeks, but some people will experience severe complications, requiring hospitalization. Some of these complications are listed above. Secondary bacterial infections are more common with influenza than with COVID-19.

Diarrhea is more common in young children with flu than in adults with flu.

 

COVID-19

Additional complications associated with COVID-19 can include:

Blood clots in the veins and arteries of the lungs, heart, legs or brain

Multisystem Inflammatory Syndrome in Children (MIS-C) and in Adults (MIS-A)

Long COVID is a range of symptoms that can last weeks or months after first being infected with the virus that causes COVID-19 or can appear weeks after infection. Long COVID can happen to anyone who has had COVID-19, even if their illness was mild, or if they had no symptoms.

 

Vaccine

Similarities:

Vaccines for COVID-19 and flu are approved and/or authorized for emergency use (EUA) by FDA.

 

Differences:

Flu

There are multiple FDA-licensed influenza vaccines produced annually to protect against the 4 flu viruses that scientists expect will circulate each year.

 

COVID-19

Three COVID-19 vaccines have been authorized for use by FDA under an EUA. Other vaccines to prevent COVID-19 are under development.

 

https://www.cdc.gov/flu/symptoms/flu-vs-covid19.htm

Posted:

Other information

Comment









Infectious Disease Doctor

Do you want information about infectious diseases??