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How long does it take for the COVID-19 vaccines to become effective?

As Canada gears up to receive up to 1.9 million more vaccines from suppliers this week – including the single-shot Johnson & Johnson – and the percentage of Canadians getting jabs continues to climb, offers an explainer on the differences between the vaccines approved by Health Canada and are available or will soon become available.

In this file photo, a woman receives her COVID-19 vaccine at a vaccination clinic in Montreal's Olympic Stadium on Tuesday, February 23, 2021. THE CANADIAN PRESS/Paul Chiasson

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