This is an excerpt from Second Opinion, a weekly roundup of health and medical science news emailed to subscribers every Saturday morning. If you haven’t subscribed yet, you can do that by clicking here.

A new coronavirus variant is taking hold in Canada, leaving experts divided over whether it will expose the weaknesses in our strategy to prioritize first doses of COVID-19 vaccines and jeopardize reopening in much of the country. 

Some worry that’s the case, but with Canada’s vaccine supply ramping up and second

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