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Delaying second dose of mRNA COVID-19 vaccine produces stronger immune response

December 1, 2021


The first peer-reviewed study in North America examining the timing between the first and second doses of COVID-19 mRNA vaccines shows that a longer dose interval leads to a stronger immune response. The study is funded by the Government of Canada through its COVID-19 Immunity Task Force (CITF).

Principal investigator Dr. Brian Grunau, Assistant Professor in UBC’s Department of Emergency Medicine and Scientist at the Centre for Health Evaluation and Outcome Sciences, indicates that these results – published today in Clinical Infectious Diseases – could inform ongoing international COVID-19 vaccination efforts.

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