Canada allows AstraZeneca vaccine recipients to get Pfizer or Moderna jab for second dose – ABC News

https://www.abc.net.au/news/2021-06-02/canada-approves-mix-match-astrazeneca-moderna-pfizer/100183778

The AstraZeneca vaccine has been linked to a rare but serious blood-clotting syndrome

Several European countries are giving Pfizer or Moderna as second doses to AstraZeneca recipients

NACI says there is emerging evidence that mixing and matching different types of vaccines is not only safe but may produce a better immune response