Canada’s National Advisory Committee on Immunization (NACI) has updated its guidance, recommending that approved COVID-19 vaccines can be safely mixed and matches in most scenarios.Under the new recommendations released June 1, people who received a first dose of the AstraZeneca vaccine may receive an mRNA vaccine — Pfizer-BioNTech or Moderna — for their second dose, unless contraindicated.But it is not recommending AstraZeneca after a first shot of Pfizer or Moderna.
2nd COVID-19 shots should be offered ‘as soon as possible’: NACI People who have received a first dose of an mRNA vaccine should be offered the same vaccine for their second dose, NACI said.