Ontarians who received the AstraZeneca COVID-19 vaccine will be able to choose between the same vaccine or an mRNA one like Pfizer-BioNTech or Moderna when booking their second-dose appointments starting on Friday. The province updated its guidance on second doses Thursday for people who received a first dose of the AstraZeneca vaccine to allow for … Continue reading Ontarians who got AstraZeneca COVID-19 vaccine can now book mRNA for 2nd dose