Ontarians who have received their first dose of the AstraZeneca COVID-19 vaccine can choose to either receive a second dose of the AstraZeneca vaccine, or an mRNA (Pfizer or Moderna) vaccine. TORONTO, ON., June 3, 2021 — The Ontario government, in consultation with the Chief Medical Officer of Health and other health experts, has just … Continue reading Ontarians allowed to mix AstraZeneca with an mRNA vaccine for second dose if desired