tetano
Editor, Senior Moderator
Can Commun Dis Rep
. 2024 Jan 1;50(1-2):40-48.
doi: 10.14745/ccdr.v50i12a05. COVID-19 outcome trends by vaccination status in Canada, December 2020-January 2022
Demy Dam[SUP] 1 [/SUP], Sharifa Merali[SUP] 1 [/SUP], Michelle Chen[SUP] 1 [/SUP], Cameron Coulby[SUP] 1 [/SUP], Brigitte Ho Mi Fane[SUP] 2 [/SUP], Felix Bang[SUP] 1 [/SUP], Jordan Robson[SUP] 1 [/SUP], Samara David[SUP] 1 [/SUP]
Affiliations
Background: The coronavirus disease 2019 (COVID-19) pandemic in Canada has evolved rapidly. Since late 2020, COVID-19 vaccines have been relied on to protect against severe outcomes in the presence of circulating variants of concern (VOC).
Objective: This surveillance report provides a retrospective descriptive analysis of national trends in COVID-19 cases and severe outcomes by vaccination status, contextualizing trends against case demographics and circulating VOCs, from December 2020 to January 2022.
Methods: Case and vaccination coverage surveillance data were obtained from the National COVID-19 Case Dataset and the Canadian COVID-19 Vaccination Coverage Surveillance System for 12 of 13 provinces and territories. Descriptive analyses were produced to describe trends over time among individuals aged 12 years and older by COVID-19 outcome, vaccination status, and demographics. Age-standardized and age-stratified incidence rates and incidence rate ratios were computed for cases, hospitalizations, and deaths.
Results: From mid to late-2021, incidence rates for cases and severe outcomes were consistently lowest among those with a completed primary series and highest among those who were unvaccinated. Unvaccinated individuals were much more likely to be hospitalized or to die compared to those with a completed primary series in all variant periods. Age-specific rates of severe outcomes were consistently highest among those aged 80 years and older across all vaccination statuses.
Conclusion: Vaccination remains one of the most important public health interventions, particularly among older adults, to protect against COVID-19 severe outcomes as the pandemic evolves. Routine monitoring of COVID-19 outcomes by vaccination status can identify changes in COVID-19 epidemiology and inform public health action and policy.
Keywords: COVID-19; public health; severe outcomes; surveillance; vaccination.
. 2024 Jan 1;50(1-2):40-48.
doi: 10.14745/ccdr.v50i12a05. COVID-19 outcome trends by vaccination status in Canada, December 2020-January 2022
Demy Dam[SUP] 1 [/SUP], Sharifa Merali[SUP] 1 [/SUP], Michelle Chen[SUP] 1 [/SUP], Cameron Coulby[SUP] 1 [/SUP], Brigitte Ho Mi Fane[SUP] 2 [/SUP], Felix Bang[SUP] 1 [/SUP], Jordan Robson[SUP] 1 [/SUP], Samara David[SUP] 1 [/SUP]
Affiliations
- PMID: 38655240
- PMCID: PMC11037879
- DOI: 10.14745/ccdr.v50i12a05
Background: The coronavirus disease 2019 (COVID-19) pandemic in Canada has evolved rapidly. Since late 2020, COVID-19 vaccines have been relied on to protect against severe outcomes in the presence of circulating variants of concern (VOC).
Objective: This surveillance report provides a retrospective descriptive analysis of national trends in COVID-19 cases and severe outcomes by vaccination status, contextualizing trends against case demographics and circulating VOCs, from December 2020 to January 2022.
Methods: Case and vaccination coverage surveillance data were obtained from the National COVID-19 Case Dataset and the Canadian COVID-19 Vaccination Coverage Surveillance System for 12 of 13 provinces and territories. Descriptive analyses were produced to describe trends over time among individuals aged 12 years and older by COVID-19 outcome, vaccination status, and demographics. Age-standardized and age-stratified incidence rates and incidence rate ratios were computed for cases, hospitalizations, and deaths.
Results: From mid to late-2021, incidence rates for cases and severe outcomes were consistently lowest among those with a completed primary series and highest among those who were unvaccinated. Unvaccinated individuals were much more likely to be hospitalized or to die compared to those with a completed primary series in all variant periods. Age-specific rates of severe outcomes were consistently highest among those aged 80 years and older across all vaccination statuses.
Conclusion: Vaccination remains one of the most important public health interventions, particularly among older adults, to protect against COVID-19 severe outcomes as the pandemic evolves. Routine monitoring of COVID-19 outcomes by vaccination status can identify changes in COVID-19 epidemiology and inform public health action and policy.
Keywords: COVID-19; public health; severe outcomes; surveillance; vaccination.