The currently authorized vaccines to prevent COVID-19 in the United States require two shots to get the most protection:
- Pfizer-BioNTech doses should be given three weeks (21 days) apart
- Moderna doses should be given one month (28 days) apart
You should get your second shot as close to the recommended 21- or 28-day interval as possible.
Additional COVID-19 vaccines are in Phase 3 clinical trials.