The latest recommendation from the National Advisory Committee on Immunization (NACI) on mixing and matching COVID-19 vaccines has offered some flexibility to Canada’s rollout — but it might come at a cost.

In non-binding guidance released Tuesday, NACI said that the mRNA vaccines from Pfizer-BioNTech and Moderna can be given as a second dose after a person has received a first shot of AstraZeneca. The two mRNA vaccines are also interchangeable if the same product is not readily available for the second dose.

And as provinces continue to update their guidance to allow Canadians’ to mix and match COVID-19 vaccines – some experts are concerned the new found flexibility could lead to doses – in high demand around the world – going to waste.

Global News Jamie Mauracher reports.

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