Canadian health officials will be providing an update on the COVID-19 pandemic Tuesday, including the National Advisory Committee on Immunization's guidance for the interchangeability of COVID-19 vaccines.

Some provinces stopped administering the use of the AstraZeneca vaccine as a first dose because of safety and supply concerns, leaving recipients awaiting their second shot in limbo.

Preliminary results from a University of Oxford study published on May 12 found that mixing the Pfizer-BioNtech and AstraZeneca COVID-19 vaccines may increase the frequency of mild to moderate side effects. But these symptoms were short-lived — lasting no longer than a few days — and there were no hospitalizations or other safety concerns.

A Spanish study showed that the presence of neutralizing antibodies rose sevenfold after people who already received a first shot of AstraZeneca vaccine were given the Pfizer dose, significantly more than the doubling effect observed after a second AstraZeneca shot.

For more info, please go to https://globalnews.ca/news/7879273/mixing-covid-vaccines-canada-study/

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