PA-DOH: Update – COVID Vaccine Second Dose Administration and Timing
- Persons receiving the second dose of an mRNA COVID-19 vaccine should follow the recommended scheduling as closely as possible.
- DOH and CDC recommend receiving the same vaccine product at both vaccinations.
- If it is not feasible to adhere to the recommended interval because of any reason, including vaccine availability, the second dose may be administered up to 6 weeks after the first dose.
- Every effort should be made to complete the vaccine series using the same vaccine product.
- If the first dose product cannot be determined or is unavailable, any available mRNA COVID-19 vaccine may be administered at a minimum interval of 28 days between doses.
- If two doses of different mRNA vaccine products are administered for any reason, no additional doses are recommended at this time.
- The discordant doses should be noted on the person’s vaccination card.
- If you have questions about this guidance, please call your local health department or 1-877-PA-HEALTH (1-877-724-3258).
Originally released by the Pennsylvania Department of Health on February 17, 2021.