TORONTO —
Canada’s National Advisory Committee on Immunization (NACI) has changed its guidelines to allow for mixing and matching COVID-19 vaccines.
Federal health officials announced the updated guidance during a press briefing on Tuesday, saying that a first dose of the AstraZeneca-Oxford/COVISHIELD vaccine can be followed up with a second AstraZeneca shot, or be safely combined with a second dose of the Pfizer-BioNTech or Moderna shots “unless contraindicated.”
The new guidance from NACI also…

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