Canada: Pfizer, Moderna COVID-19 vaccine preferred 2nd dose after AstraZeneca
https://healthell.blogspot.com/2021/06/canada-pfizer-moderna-covid-19-vaccine.html
Canada: Pfizer, Moderna COVID-19 vaccine preferred 2nd dose after AstraZeneca
Canada's National Advisory Committee on Immunization said Thursday people who got the AstraZeneca vaccine as their first dose should get Pfizer-BioNTech or Moderna for their second shot.
