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Influenza vaccination uptake among Canadian adults before and during the COVID-19 pandemic: An analysis of the Canadian Longitudinal study on Aging (CLSA).
Sulis, Giorgia; Basta, Nicole E; Wolfson, Christina; Kirkland, Susan A; McMillan, Jacqueline; Griffith, Lauren E; Raina, Parminder.
  • Sulis G; Department of Epidemiology, Biostatistics, and Occupational Health, School of Population and Global Health, Faculty of Medicine and Health Sciences, McGill University, Montreal, Quebec, Canada.
  • Basta NE; Department of Epidemiology, Biostatistics, and Occupational Health, School of Population and Global Health, Faculty of Medicine and Health Sciences, McGill University, Montreal, Quebec, Canada. Electronic address: nicole.basta@mcgill.ca.
  • Wolfson C; Department of Epidemiology, Biostatistics, and Occupational Health, School of Population and Global Health, Faculty of Medicine and Health Sciences, McGill University, Montreal, Quebec, Canada; Department of Medicine, McGill University, Montreal, Quebec, Canada; Research Institute of the McGill Univ
  • Kirkland SA; Department of Community Health & Epidemiology, and Division of Geriatric Medicine, Faculty of Medicine, Dalhousie University, Halifax, Nova Scotia, Canada.
  • McMillan J; Department of Medicine, Section of Geriatric Medicine, University of Calgary, Calgary, Alberta, Canada; O'Brien Institute for Public Health, University of Calgary, Calgary, Alberta, Canada.
  • Griffith LE; Department of Health Research Methods, Evidence, and Impact, McMaster University, Hamilton, Ontario, Canada; Labarge Centre for Mobility in Aging, McMaster University, Hamilton, Ontario, Canada; McMaster Institute for Research on Aging, McMaster University, Hamilton, Ontario, Canada.
  • Raina P; Department of Health Research Methods, Evidence, and Impact, McMaster University, Hamilton, Ontario, Canada; Labarge Centre for Mobility in Aging, McMaster University, Hamilton, Ontario, Canada; McMaster Institute for Research on Aging, McMaster University, Hamilton, Ontario, Canada; Department of P
Vaccine ; 40(3): 503-511, 2022 01 24.
Article in English | MEDLINE | ID: covidwho-1598441
ABSTRACT

INTRODUCTION:

Understanding how influenza vaccine uptake changed during the 2020/2021 influenza season compared to previous pre-pandemic seasons is a key priority, as is identifying the relationship between prior influenza vaccination and COVID-19 vaccine willingness.

METHODS:

We analyzed data from a large, nationally representative cohort of Canadian residents aged 50 and older to assess influenza vaccination status three times between 2015 and 2020. We investigated 1) changes in self-reported influenza vaccine uptake, 2) predictors of influenza vaccine uptake in 2020/2021, and 3) the association between influenza vaccination history and self-reported COVID-19 vaccine willingness using logistic regression models.

RESULTS:

Among 23,385 participants analyzed for aims 1-2, influenza vaccination increased over time 14,114 (60.4%) in 2015-2018, 15,692 (67.1%) in 2019/2020, and 19,186 (82.0%; combining those already vaccinated and those planning to get a vaccine) in 2020/2021. After controlling for socio-demographics, history of influenza vaccination was most strongly associated with influenza vaccination in 2020/2021 (adjusted odds ratio [aOR] 147.9 [95% CI 120.9-180.9]); this association remained after accounting for multiple health and pandemic-related factors (aOR 140.3 [95% CI 114.5-171.8]). To a lesser degree, those more concerned about COVID-19 were also more likely to report influenza vaccination in fall 2020, whereas those reporting a very negative impact of the pandemic were less likely to get vaccinated. Among 23,819 participants with information on COVID-19 vaccine willingness during the last quarter of 2020 (aim 3), prior influenza vaccination was most strongly associated with willingness to get a COVID-19 vaccine (aOR 15.1 [95% CI 13.5-16.8] for those who had received influenza vaccine at all previous timepoints versus none).

CONCLUSIONS:

Our analysis highlights the importance of previous vaccination in driving vaccination uptake and willingness. Efforts to increase vaccination coverage for influenza and COVID-19 should target individuals who do not routinely engage with immunization services regardless of demographic factors.
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Keywords

Full text: Available Collection: International databases Database: MEDLINE Main subject: Influenza Vaccines / Influenza, Human / COVID-19 Type of study: Cohort study / Observational study / Prognostic study / Randomized controlled trials Topics: Vaccines Limits: Adult / Aged / Humans / Middle aged Country/Region as subject: North America Language: English Journal: Vaccine Year: 2022 Document Type: Article Affiliation country: J.vaccine.2021.11.088

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Full text: Available Collection: International databases Database: MEDLINE Main subject: Influenza Vaccines / Influenza, Human / COVID-19 Type of study: Cohort study / Observational study / Prognostic study / Randomized controlled trials Topics: Vaccines Limits: Adult / Aged / Humans / Middle aged Country/Region as subject: North America Language: English Journal: Vaccine Year: 2022 Document Type: Article Affiliation country: J.vaccine.2021.11.088