Canadians who received AstraZeneca COVID-19 vaccine can choose mRNA as second dose: National Advisory Committee on Immunization
Andrew Vaughan/The Canadian Press
Viral vector vaccines, like those from AstraZeneca, Covishield, and Johnson & Johnson, are linked to a rare blood-clot condition that mRNA vaccines, like those from Pfizer and Moderna, are not connected to. The risk of that rare side effect is one of several factors leading to the advice that vaccines can be mixed.
“NACI recommendations are based on the strength of emerging evidence over top of a strong foundation of many decades of experience with vaccine programs in Canada,” Chief Public Health Officer Theresa Tam said Tuesday.
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