Initial results from a new Canadian study are reinforcing the importance of getting that second COVID-19 vaccine shot — particularly if the first dose was AstraZeneca.

The study, which was supported by the federal government, found a single dose of either the Pfizer-BioNTech or Moderna vaccine produced short-term antibody levels more than one-and-a-half times greater than those produced by one dose of AstraZeneca.

As Jamie Mauracher reports, the findings add urgency to efforts to get second COVID-19 vaccine doses into arms as quickly as possible.

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