Canada's Chief Public Health Officer Dr. Theresa Tam and Deputy Chief Public Health Officer Dr. Howard Njoo spoke to the media on Tuesday after Canada’s National Advisory Committee on Immunization (NACI) updated its guidance, recommending that approved COVID-19 vaccines can be safely mixed and matches in most scenarios.

People who have received a first dose of an mRNA vaccine should be offered the same vaccine for their second dose, NACI said. But mRNA vaccines can be interchangeable if the same product is not readily available for the second dose, it added.

The non-binding recommendations were based on a range of factor — from safety concerns to vaccine supply, Theresa Tam, Canada’s chief public health officer, said during a news conference Tuesday.

“The interchangeability of vaccines means that you can receive one vaccine product for your first dose and then safely receive a different vaccine for your second dose to complete your two-dose vaccine series for optimal protection from COVID-19,” Tam said.

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