Extended dose intervals for COVID-19 vaccines to optimize early vaccine rollout and population protection in Canada in the context of limited vaccine supply

Since COVID-19 vaccines were first authorized in Canada in December 2020, the National Advisory Committee on Immunization (NACI) has been providing evidence-informed guidance on the recommended interval between vaccine doses.

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Last Updated April 17, 2026, 21:39 (UTC)
Created April 17, 2026, 21:39 (UTC)
criticality_level []
geographic_scope []
open_canada_collection publication
open_canada_date_published 2021-04-14 00:00:00
open_canada_keywords {"fr": ["Vaccins COVID-19", "COVID-19", "intervalles entre les doses", "déploiement du vaccin", "approvisionnement limité en vaccins", "Comité consultatif national de l'immunisation", "CCNI", "intervalle recommandé entre les doses de vaccin"], "en": ["COVID-19", "COVID-19 vaccines", "dose intervals", "vaccine rollout", "limited vaccine supply", "National Advisory Committee on Immunization", "NACI", "recommended interval between vaccine doses"]}
open_canada_subject ["health_and_safety"]
sensitivity_level unrestricted
title_fr Allongement des intervalles entre les doses des vaccins contre la COVID-19 pour optimiser les campagnes de vaccination précoces et la protection des populations au Canada dans le contexte d’un approvisionnement limité en vaccins
update_frequency as_needed