About CANVAS

About the CANVAS-COVID Study

Why: The purpose of this study is to find out how often health events occur after a COVID-19 vaccine. The CANVAS surveillance network complements Canada’s passive vaccine safety surveillance system with rapid information early in the COVID-19 vaccine campaign. 

Who: You can take part in this study if you have an email address, telephone number and a device to answer online surveys. If you have been vaccinated click here. If you have not been vaccinated click here.

Where: This study will take place in 5 Provinces and Territories: British Columbia, Alberta, Ontario, Nova Scotia, and the Yukon.

How your participation makes a difference: 

By joining our study you are contributing valuable early data on the safety of COVID-19 vaccines in Canadians. Post-marketing vaccine safety surveillance is an important step in ensuring vaccine safety. 

Study Activities

Study participants will be asked to complete two or three online surveys:

  • 8 days AFTER you get the first COVID-19 vaccine
  • 8 days AFTER you get the second COVID-19 vaccine (if you are given a second dose)
  • 6 months AFTER your second COVID-19 vaccine


The surveys will collect basic demographics data about you (age, sex, gender, underlying health conditions) and any information about illnesses since your last vaccine. 

If you report a health problem which required a medical visit, we may call you to find out more about the symptoms of the health problem. 


Non-Vaccinated Group

The purpose of the study is to find out how often health events occur after a COVID-19 vaccine. To do this, we also need to monitor health events in people who did NOT get a COVID-19 vaccine. We need to measure the background illness of the population because it helps us better measure any increase in illness that may happen after getting a COVID-19 vaccine.

You can participate in the non-vaccinated (control) group if you have NOT received a COVID-19 vaccine. If you would like to participate, you will need to complete 1 or 3 online surveys. These surveys will measure the amount of illness in your community (background illness) when COVID-19 vaccines are being used.

If you join the non-vaccinated group, you may also re-join later once you’ve received the vaccine under the vaccinated group.


CANVAS History

The Canadian National Vaccine Safety (CANVAS) network is designed to conduct active safety surveillance for pandemic vaccines (e.g. H1N1 influenza vaccine in 2009), seasonal influenza vaccines (2010-2020) and other new vaccines (e.g. meningococcal B vaccine in Quebec in 2014) to inform public health authorities about their safety.