Ontario Suspends AstraZeneca Vaccine

Ontario announced Tuesday that it is suspending use of the AstraZeneca vaccine, which has been linked to several, sometimes fatal, thrombosis cases.

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“From now on, Ontario will temporarily stop distributing and administering the first doses of the AstraZeneca vaccine,” said Provincial Chief Medical Officer, Dr.R David Williams at a press conference.

According to the press release, DR Williams explained that to date, Ontario has a 0.9 thrombosis rate per 100,000 doses given for the AstraZeneca vaccine. This increases to 1 case per 100,000 doses for COVISHIELD, the Indian counterpart of AstraZeneca.

“However, over the past few days, the number of reports of TTIV has increased, amounting to 1.7 per 100,000 doses administered,” the doctor lamented.

To date, just over 650,000 doses of AstraZeneca and just over 200,000 doses of COVISHIELD have been administered in Ontario.

With Moderna and Pfizer-BioNTech vaccine supplies more reliable and new COVID-19 cases declining in Ontario, the province can afford to do without AstraZeneca, Judge D.R Williams.

The province is currently investigating a second dose that would pose a lower risk of thrombosis than the first, according to data from the United Kingdom, where AstraZeneca serum has been widely used to inoculate the population.

The mixability of vaccine types should also be analyzed by the National Advisory Committee on Immunization (NACI), said Dr.R Williams, noting that early results in this direction seem “promising.”

To date, Canada has recorded at least three deaths related to a controversial vaccine distributed in Alberta, Quebec and New Brunswick.

NACI recommended limiting the use of this vaccine to people 55 and older before changing their mind and allowing it to 30 and older. Quebec, for its part, restricts its use to people aged 45 and over and specifies the vaccination clinics that use this product when making online appointments.


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