You may have side effects after vaccination. These are normal and should go away in a few days.
It typically takes two weeks after vaccination for the body to build protection (immunity) against the virus that causes COVID-19. You are not fully vaccinated until 2 weeks after the 2nd dose of a two-dose vaccine or two weeks after a one-dose vaccine.
Vaccines are monitored by VAERS and several other vaccine safety monitoring systems as part of the most intensive vaccine safety monitoring effort in U.S. history. This continuous, robust safety monitoring helps keep COVID-19 vaccines safe and helps ensure the benefits of vaccination continue to outweigh any risks.