Some Canadians slated for a second dose of the Pfizer COVID19 vaccine, in the coming week, will instead be offered Moderna.

The news comes after the federal government announced it was facing a shipment delay. On Monday, some Ontarians were turned away from their Pfizer vaccine appointments because of the lack of supply despite national and provincial guidance to mix mRNA vaccine doses.

As Jamie Mauracher reports, it has again prompted the question: is mixing safe and effective?

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