The revamped vaccine is an effort by regulators and vaccine makers to keep pace with the virus, which continues to evolve
, a decision that means some of the millions of mRNA shots Ottawa has ordered for this season should begin arriving within days.
The U.S. Food and Drug Administration approved both Moderna’s and Pfizer-BioNTech’s updated mRNA shots on Aug. 22. A week later, it green-lit a new version of Novavax’s protein subunit vaccine, a shot that is also under review by Health Canada.
KP.3.1.1, a sublineage of the JN.1 strain, has two notable mutations, said Fiona Brinkman, a professor of genomics and bioinformatics at Simon Fraser University who monitors the evolution of the virus for the Coronavirus Variants Rapid Response Network, or CoVaRR-Net.
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