Vaccine Protection Over Time

Change in the Level of Vaccine Protection Over Time in COVID-19 Vaccinated Individuals: A Rapid Review

Project Status:Complete

Knowledge User(s)

Public Health Agency of Canada

Patient/Public Partner(s)

Cynthia Lisée, Emilie Rufray

Project Trainee(s)

Keven Joyal-Desmarais, Ariany M Vieira

Funding Source(s)

  • Canadian Institutes of Health Research (CIHR) through COVID-END

Project Objectives

To identify, appraise, and summarise emerging research evidence to support evidence-informed decision making and answer the question: How does the level of vaccine protection, including effectiveness against asymptomatic and symptomatic infection, and severe outcomes change over time in individuals who have received a complete primary COVID-19 vaccine series?

Research Approach

Rapid Review

Project Lead(s)

Simon Bacon

Position: Montreal Behavioural Medicine Centre, Concordia University

Dr. Bacon’s research deals with the impact of health behaviours and lifestyle (e.g., physical activity, diet, weight management, stress) on the development and progression of chronic diseases (e.g., obesity, cardiovascular disease, COVID-19). He utilises multiple methodologies including epidemiological, psychophysiological, evidence syntheses, and behavioural trials designs. Currently, Dr. Bacon is the FRQS co-Chair in Artificial Intelligence and Digital Health for Health Behaviour Change and the CIHR SPOR Chair in Innovative, Patient-Oriented, Behavioural Clinical Trials. He is also a fellow of the Obesity Society, the Canadian Cardiovascular Society, and the Academy of Behavioral Medicine Research. In addition to Concordia, Dr. Bacon is co-director of the Montreal Behavioural Medicine Centre (, a researcher at the Centre intégré universitaire de santé et de services sociaux du Nord-de-l’Île-de-Montréal (CIUSSS-NIM), and co-leads the International Behavioural Trials Network ( and the CIHR funded Canadian Behavioural Interventions and Trials Network (

Simon Bacon

Montreal Behavioural Medicine Centre, Concordia University

Dr. Bacon’s research deals with the impact of health behaviours...