Nearly 20 per cent of people in Canada have been fully vaccinated against COVID-19, making almost all of them immune to the virus. But how long will that immunity last? The answer to that question will dictate what the years ahead will look like for us as we fight to put the pandemic behind us.

Globe and Mail science reporter Ivan Semeniuk on what scientists have learned about the way our bodies develop immunity to the novel coronavirus, how long it might last and why we might be getting regular COVID-19 vaccines in the years to come.

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