It could take up to three weeks after your last dose of the vaccine to have protection. After that time, because the vaccine has shown high effectiveness, we are hopeful that most people who have received two doses of the vaccine will not be required to quarantine, but we await further guidance from the Advisory Committee on Immunization Practices (ACIP).
At this time, please continue to quarantine after exposure to COVID-19, even if you have been vaccinated. While experts learn more about the protection that COVID-19 vaccines provide under real-life conditions, it will be important for everyone to continue using all the tools available to us to help stop this pandemic. Health experts need to understand more about the protection that COVID-19 vaccines provide before deciding to change this recommendation.