I already had COVID-19—why do I still need the vaccine?

The CDC recommends all people age 5 and older get vaccinated against COVID-19, including people who were previously infected with the virus. Data show that immunity in people who have been infected with COVID-19 wanes over time, and scientists continue to study this. New data show that COVID-19 vaccination can provide a higher, more robust, and more consistent level of immunity to protect people from COVID-19 than antibodies from infection alone. 

COVID-19 vaccination is effective in preventing reinfection in people who previously had COVID-19. One study, for example, showed that among people hospitalized with COVID-19, those who were previously infected with COVID-19 were 5 times more likely to get COVID-19 again if they were unvaccinated than people who were fully vaccinated. For that reason, even if you have already had COVID-19, vaccination is an important step to protect yourself and those around you.

Updated November 15, 2021