Cdc Flu Portal

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Updated: May 21, 2022

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Cdc.gov

FAQs

1

How long does it take for COVID-19 symptoms to appear?

Symptoms usually appear 2 to 6 days after exposure to the virus. However, it sometimes takes longer — up to 14 days
2

Can a person who has been infected with COVID-19 get infected again?

The immune system responds to COVID-19 infection by stimulating white blood cells called lymphocytes to form antibodies that fight the infection. These antibodies and lymphocytes retain a temporary protective effect against reinfection. But it is only temporary. There have been many confirmed cases of reinfection with COVID-19. In other words, a person got sick with COVID-19, recovered, and then became infected again.

3

When are people infected with COVID-19 most likely to be contagious?

Researchers estimate that people who get infected with the coronavirus can spread it to others 2 to 3 days before symptoms start and are most contagious 1 to 2 days before they feel sick.
4

What happens if you take the second COVID-19 vaccine?

When you take two doses of a COVID-19 vaccine, the first dose is the first time for your body to see the spike protein that the COVID-19 vaccines produce, and your body begins to develop an immune response. But that happens slowly. Then when you come back with a second dose, your body is ready to attack it.
2. Vaccines.gov

Find COVID-19 Vaccines & BoostersI'm looking for flu vaccines ... Visit the CDC's Frequently Asked Questions page for information about COVID-19 ...

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