OTTAWA—Canada’s anxiety-laden COVID-19 vaccine programs are facing further threats as Europe warns drug makers it might impose export controls on European-made vaccine doses. All of Canada’s current vaccine doses from Pfizer-BioNTech and Moderna are made in Europe, potentially putting at risk the entirety of Canada’s vaccine deliveries. European Commission President Ursula von der Leyen said in a video statement posted to Twitter Tuesday that Europe will set up a “vaccine export transparency mechanism” so Europe knows exactly how many doses are being produced in the world’s largest trading bloc and where they are being shipped. “Europe invested billions to help develop the world‘s first COVID−19 vaccines to create a truly global common good,” she said. “And now the companies must deliver.” Europe—like Canada—is being shorted on deliveries from Pfizer as the company slows production to expand its plant in Belgium. Canada is getting no deliveries at all from Pfizer this …