mRNA COVID-19 vaccines should be 2nd dose after AstraZeneca shot: NACI

Canada’s National Advisory Committee on Immunization (NACI) updated its guidance, now recommending that mRNA COVID-19 vaccines like Pfizer and Moderna are the preferred second doses for those who took AstraZeneca as their first.

Read more: NACI recommends mixing AstraZeneca, Pfizer, Moderna COVID-19 vaccines

The change was announced during a press conference on Thursday by Canada’s Chief Public Health Officer Dr. Theresa Tam.

“An mRNA vaccine should now be offered as the second dose for individuals who received a first dose of AstraZeneca or COVISHIELD vaccine,” said Tam, who was also joined by several other public health officials in charge of the country’s COVID-19 response and vaccine rollout.

Click to play video: 'NACI approves vaccine mixing' 2:09 NACI approves vaccine mixing

NACI approves vaccine mixing – Jun 1, 2021

Previously, NACI also said the vaccines from Pfizer and Moderna could be used interchangeably.

On Thursday, Tam appeared to reverse that guidance, saying that NACI now recommends anyone who received an mRNA vaccine as their first dose seek the same mRNA vaccine for their second.

More to come…

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