Canada authorizes the AstraZeneca vaccine.The addition of a third vaccine may ease the country’s growing dissatisfaction about the sluggish pace of vaccinations.By Ian Austen

Canada’s drug regulator authorized the AstraZeneca vaccine on Friday as well as a version of it developed by the Serum Institute of India. The vaccine, which was developed with Oxford University, has not yet been authorized for use in the United States but has been key to Britain’s rapid vaccination rollout.

The addition of a third vaccine, in addition to the offerings from Moderna and Pfizer-BioNTech, may help Canada alleviate a growing dissatisfaction about the sluggish pace of vaccination in the country.

The AstraZeneca vaccine, the first virus vector-based inoculation for Covid-19 authorized in Canada, has had some stumbles.

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