Quarantine after possible exposure to COVID-19 and stay home to monitor your health. Isolate when you have been infected with the virus and stay separated from others in your household.
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After the U.S. Food and Drug Administration (FDA) approves a vaccine or authorizes a vaccine for emergency use, experts continue to assess vaccine effectiveness or how a vaccine works in real-world conditions. The goal is to understand how a vaccine protects people outside of strict clinical trial settings.
CDC and other partners will continue to assess how COVID-19 vaccines work in real-world conditions. Assessing how vaccines work in the real-world is important to:
Learn if vaccines offer the same protection seen in clinical trials.
Adjust vaccine recommendations, as needed.
Learn why and how often breakthrough cases (people getting sick after vaccination) occur.
Key Things to Know About COVID-19 Vaccines
Key Things to Know About COVID-19 Vaccines Updated Mar. 13, 2021
You may have side effects after vaccination, but these are normal.
It typically takes two weeks after you are fully vaccinated for the body to build protection (immunity) against the virus that causes COVID-19.
Vaccines will become widely available, in the coming months. Find a COVID-19 vaccine.
People who have been fully vaccinated can start to do some things that they had stopped doing because of the pandemic.
What We are Still Learning
We are still learning how well vaccines prevent you from spreading the virus that causes COVID-19 to others, even if you do not have symptoms.