COVID-19 vaccines teach our immune systems how to recognize and fight the virus that causes COVID-19. It typically takes two weeks after vaccination for the body to build protection (immunity) against the virus that causes COVID-19. That means it is possible a person could still get COVID-19 before or just after vaccination and then get sick because the vaccine did not have enough time to provide protection.  People are considered fully protected two weeks after their second dose of the Pfizer-BioNTech (ages 16 years and up) or Moderna COVID-19 vaccine (ages 18 years and up). FIND A VACCINE IN MN (ages 16 years and up) JOIN WAIT LIST FOR Child and Teen Medical Center’s COVID vaccines (vaccines coming soon for those ages 16 years and up)