Ontario Accelerates Second Doses of AstraZeneca COVID-19 Vaccine

Published on June 13, 2021
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Ontario Accelerates Second Doses of AstraZeneca COVID-19 Vaccine

The Ontario government, in consultation with the Chief Medical Officer of Health and other health experts, including the Ontario Science Advisory Table, is further accelerating the second dose interval for individuals who received their first dose of an AstraZeneca COVID-19 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.

This decision is based on emerging clinical evidence about the administration of two doses of different vaccines, as supported by the National Advisory Committee on Immunization (NACI). Evidence from multiple studies indicates that mixing of COVID-19 vaccines (receiving an mRNA vaccine after an AstraZeneca vaccine) at dosing intervals between eight and 12 weeks is safe and demonstrates a beneficial immune response. There is evidence that a longer interval between two doses of the AstraZeneca vaccine (such as a 12-week interval) provides higher protection.

Beginning Monday, June 14, 2021 at 8:00 a.m., 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.

Individuals who wish to receive second dose of the AstraZeneca vaccine can contact the pharmacy or primary care provider where they received their first dose, or another participating pharmacy.

All Ontarians are encouraged to get vaccinated as soon as they can, and to receive their second dose as soon as they are eligible and within the recommended interval to ensure maximum protection against COVID-19.

 
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