Shouldn’t these studies have been done before vaccine recommendations were made?

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.

“We are certainly trying to encourage individuals, particularly if they’ve gotten the AstraZeneca vaccine, to get that second dose,” said Dr. Philip Awadalla, the national scientific director of the Canadian Partnership for Tomorrow’s Health (CanPath), which conducted the study.

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