What’s the difference between COVID-19 and seasonal influenza?

Flu vs Covid
To avoid cross-infection of flu and COVID-19, doctors will recommend flu shots. But many people have doubts about vaccination: “Do I still need to get a flu shot after being vaccinated against COVID-19?”, “Can the two vaccines be inoculated together? Will it be bad for my body?”, “Is an interval needed between a flu shot and COVID-19 vaccine?”. The following will reveal the answers to the questions on flu vaccines and COVID-19 vaccine.

What is Seasonal Influenza?
Why should I get a flu shot?

“Seasonal influenza” is an acute respiratory disease caused by the influenza virus. It is mainly transmitted through droplets. In Hong Kong, influenza is generally prevalent from January to March in winter and July and August in summer. People generally believe that flu is not that different from the common cold, but this is wrong! Symptoms of influenza are more severe than common cold and can lead to very serious complications or mild to severe illness, and even death. Therefore, seasonal influenza vaccination is one of the effective ways to prevent seasonal influenza and its complications, and can also reduce the cases of hospitalization and death due to influenza.

What’s the difference between COVID-19 and seasonal influenza?

The COVID-19 pandemic is still persisting, but seasonal influenza cannot be overlooked. Both are caused by viral infections, and the symptoms of influenza and COVID-19 are very similar.
 
COVID-19
Influenza
Symptoms
Fever, sore throat, nasal congestion, runny nose, diarrhea, fatigue, abdominal pain and diarrhea, nausea, muscle ache
Fever, sore throat, dry cough, fatigue, muscle ache, severe complications include pneumonia, encephalitis, myocarditis and other secondary Infection or neurological symptoms, etc., and may cause death
Incubation Period
3 – 10 days
About 1 – 4 days
Epidemic Seasons
Throughout the year
Throughout the year, the peak period is from November to March
Mode of Transmission
Airborne infection: inhalation of larger respiratory secretion particles in the air or smaller infectious particles suspended in the air for a long time.
Contact infection: contact with infectious respiratory secretions on skin and environmental surfaces, then contact with eyes or nose.
Airborne infection: inhalation of larger respiratory secretion particles in the air or smaller infectious particles suspended in the air for a long time.
Contact infection: contact with infectious respiratory secretions on skin and environmental surfaces, then contact with eyes or nose.
Do I still need to get a flu shot after being vaccinated against COVID-19?
Yes, because you can be infected with flu and COVID-19 at the same time. With the gradual relaxation of entry restrictions and social distancing measures in Hong Kong, the spread of influenza may increase, thus further leading to the possibility of co-epidemic of influenza and COVID-19. In order to avoid the double infection of COVID-19 and influenza, the best advice is to get a flu shot! Many people underestimate the severity of influenza, but the Hong Kong Medical Association has emphasized that during the peak of influenza before the COVID-19 pandemic, there has been about 400 deaths every year. Therefore, the severity of influenza should not be underestimated. Even if one has received multiple doses of COVID-19 vaccine, they should also get the flu shot to reduce the interaction between the two viruses, prevent double infection and developing more severe cases.
Can the COVID-19 vaccine be received at the same time as the seasonal flu vaccine?
With informed consent, the COVID-19 vaccine can be administered at the same time as seasonal influenza vaccine (including inactivated influenza vaccine, live attenuated influenza vaccine and recombinant influenza vaccine), or at any time before or after other vaccines. If the vaccinated person or their parents want to vaccinate the COVID-19 vaccine and the live attenuated vaccine (such as MMRV vaccine, which could prevent Measles, Mumps, Rubella and Varicella; live attenuated nasal spray flu vaccine) at separate times, a 14 days interval will suffice.

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