AstraZeneca COVID-19 vaccine paused in 2 Canadian provinces

Global News looks at Ontario halting first doses of AstraZeneca's COVID-19 vaccine amid an increased risk of a rare blood clot linked to the shot. The decision also comes after Alberta made a similar move, saying it's primarily because of the vaccine's dwindling supply. Eric Sorensen reports on the growing uncertainty and the evolving science around the vaccine.

See also another story about calls from labour leaders that are growing for Alberta to shut down the province's oil sands operations, as COVID-19 outbreaks within them continue to worsen and more workers fall ill. Heather-Yourex West looks at the biggest outbreak at Canadian Natural Resource's Horizon oilsands site, and how it managed to grow out of control.