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AstraZeneca second dose: Should I get the same vaccine or choose Pfizer or Moderna?

By Alexander Wong, Associate Professor, Infectious Diseases, University of Saskatchewan
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Hundreds of thousands of Canadians got a shot of AstraZeneca's COVID-19 vaccine for their first dose. They now have a choice for their second dose: AstraZeneca again, or Pfizer or Moderna mRNA vaccine?


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