Canada's 2025/26 seasonal COVID-19 vaccine reduced illness risk by 50% at 9 weeks post-vaccination, according to interim analysis published in Eurosurveillance. The vaccine offered protection beyond its target strain.
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Seasonal COVID-19 vaccination in 2025/26 reduced risk of illness by half in Canada
50% % Illness risk reduction
9 Weeks weeks Time to peak effectiveness
Beyond Target Strain Protection scope
9 Weeks Post-Vaccination protection period