There are several reasons for this change:
• The rates of rare blood clots with this vaccine are rising – the province quoted a 1:60,000 chance.
• We are starting to see falling rates of COVID-19 infection in the province.
• There are increasing supplies of other vaccines coming into Ontario.
If you have already been vaccinated, you did the right thing by protecting yourself and others around you. Having a first dose of any vaccine provides significant protection against serious illness and death should you become infected with COVID-19.
If you received the AZ vaccine within the past 28 days, the chances of serious side effects remain very small – but you should know the signs, as these rare blood clots can be treated if addressed early. Please reach out to our office or seek emergency care if you have the warning symptoms.
What this pause means for second doses is not clear at this moment.
There is a more predictable supply of other vaccines coming and Canada should have information on mixing and matching different vaccine brands in the next 1 or 2 weeks based on a large study being conducted in the United Kingdom: https://www.cbc.ca/news/politics/vaccines-mix-and-match-1.6020986.
We will update you as soon as we have information. You can also check the provincial and our local public health unit website as well. Ontario’s central vaccine management system has a record of when and where you were vaccinated and with which vaccine — so no one will be left behind with a second dose.