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Influenza (flu) and COVID-19 are both contagious respiratory illnesses, 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.

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 like the one conducted at DocSun biomed 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.

Similarities:
• 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, 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 symptom anywhere from 1 to 4 days after infection.

COVID-19
Typically, a person experiences symptom about 5 days after being infected, but symptoms can appear 2 to 14 days after infection.

COVID-19
How long one 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.

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.

COVID-19 seems to cause more serious illnesses and complications, including:
• Pneumonia
• Respiratory failure
• Acute respiratory distress syndrome
• Sepsis
• Cardiac injury
• Multiple-organ failure
• 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).

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