According to the CDC, older children and adults who have influenza are likely most contagious during the first 3-4 days of their illness. Alternatively, those with COVID-19 are likely to be most infectious 1 day before symptoms begin. COVID-19 is more likely to be spread by those who are asymptomatic, although both diseases may be spread by symptomatic individuals. The onset of influenza symptoms is typically 1-4 days after infection, whereas COVID-19 symptoms may develop 2-5 days, but as long as 14 days, after infection.
Seasonal influenza and COVID-19 share many symptoms:
Shortness of breath or difficulty breathing
Runny or stuffy nose
Muscle pain or body aches
Learn more about COVID-19.
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Cite this: Michael Stuart Bronze. Fast Five Quiz: Influenza During the COVID-19 Pandemic - Medscape - Nov 15, 2022.