Ontario to provide update on COVID-19 vaccine rollout Friday

Ross Houston
May 28, 2021

The province said those who got their first doses of the AstraZeneca vaccine between March 10 and March 19 are being prioritized to receive their second dose. That and more was laid out in a background briefing by government officials on Friday morning.

"Ontarians who have had their first dose and are eligible for an accelerated second dose may be able to return to the same site or channel where they received their first dose for their second dose appointment, or may choose to book an appointment at a different site or channel", the province stated.

While the interval between first and second doses can be up to 16 weeks, Ontario will begin to offer second dose appointments at an earlier interval, based on availability of vaccines.

You can count on TVO to cover the stories others don't-to fill the gaps in the ever-changing media landscape. "While not everyone will be able to get their second dose shot four weeks after their first, we want to make sure you are fully immunized as soon as possible".

Read the full presentation below.


For those who received their first dose between March 8 and April 18, they can start booking their second dose in the week of June 28, depending on supply. For those in public health units who use their own booking system, or who received their doses from the primary care provider or through a pop-up clinic, more information is to come on how and when second dose booking and rebooking will be available.

Week of May 31: individuals aged 80+. For example, this included individuals with the highest-risk health conditions and special education workers.

Ontarians who received their first shot between May 10 and May 30, and those who cannot work from home and who have at-risk health conditions, can then book their second shot starting August 2.

Two doses of vaccines that are now being administered in Ontario are needed for full immunization against COVID-19. Currently, AstraZeneca doses in the province and future shipments have been earmarked for second doses, with first-dose appointments halted due to low supply of the serum.

To support this accelerated rollout, the province has developed an anticipated schedule for eligibility to accelerate second doses based on confirmed supply. Ontario has since said it will use the vaccine as a second dose only.


Thousands of doses of the AstraZeneca vaccine in Ontario may not be used due to problems with storage data.

To this end, those 80 and over in 2021 will be eligible to book their second dose appointment beginning May 31 at 8:00 a.m.

The province now does not have enough supply of AstraZeneca to provide everyone who received it with a second shot and is exploring the option of mixing vaccines.

Individuals who have received Pfizer or Moderna for their first shot will receive the same shot for the second dose, barring unforeseen circumstances.

As outlined in the province's three-step reopening plan, stage two would begin once 20 per cent of Ontarians are fully vaccinated and stage three would commence with 25 per cent having both doses. Provincial health officer Dr. Bonnie Henry says there are enough confirmed deliveries of Pfizer and Moderna that the province is able to move up the interval.


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