As of May 11th, Ontario paused the administration of first doses of AstraZeneca Vaccine. Ontario Pauses Administration of AstraZeneca Vaccine | Ontario Newsroom
On May 21, Ontario announced that second dose administration of AstraZeneca is proceeding. Ontario Proceeding with Second Dose Administration of AstraZeneca | Ontario Newsroom.
On June 3, 2021 Ontario updated guidance for individuals who received the first dose of the AstraZeneca vaccine and who have not yet received their second dose, to allow for the mixing of COVID-19 vaccines if desired. This decision is in alignment with updated guidance from the National Advisory Committee on Immunization (NACI) recommendation. Ontario Updating AstraZeneca Second Dose Guidance | Ontario Newsroom 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 for their second dose. Both second-dose options available to individuals who received their first dose of the AstraZeneca vaccine are safe and provide strong protection against COVID-19 and will count as a completed series.
On June 12th, 2021, Ontario accelerated the second dose interval for individuals who received their first dose of an AstraZeneca vaccine. With informed consent, individuals can choose between a second dose of AstraZeneca or an mRNA vaccine, at an eight to 12-week interval, recognizing that while waiting 12 weeks helps to ultimately provide more protection, some may choose to receive their second dose sooner to have the increased protection provided by a second dose earlier. All of these options provide protection against COVID-19, including the Delta variant, and have been deemed safe.
Individuals who wish to receive an mRNA vaccine for their second dose can book an appointment through the provincial booking system, through public health units that use their own booking system, or a participating pharmacy. For individuals who wish to receive second dose of the AstraZeneca vaccine, individuals can contact the pharmacy or primary care provider where they received their first dose.
Ontario Accelerates Second Doses of AstraZeneca COVID-19 Vaccine | Ontario Newsroom
If you has an AstraZeneca / COVISHIELD COVID-19 vaccine as your first dose, you have a choice about the type of vaccine you would like for your second dose. COVID-19 Vaccine Information for Individuals who received a first dose of the AstraZeneca/COVISHIELD COVID-19 vaccine (gov.on.ca).