SeroTracker is an online tool that tracks and visualizes global COVID-19 serology testing data – testing that examines blood samples for antibodies that indicate a person has been exposed to the novel coronavirus. SeroTracker was initiated in early April 2020 to serve the COVID-19 Immunity Task Force’s need for global serological testing data as well as creating a dashboard focused on Canadian seroprevalence studies. To date, the Canadian dashboard includes 14 studies carried out across the country, each with varying estimates of how far we are from herd immunity. Follow the guide here and view the information here: www.serotracker.com/en/Canada
Seroprevalence estimates in Canada by their geographic area: This map shows studies that have investigated levels of antibodies to SARS-CoV-2, suggesting a previous infection, in Canada. Studies shown can be at a local level (city), regional (province/territory or several cities), or national (across provinces and territories). The information shown when hovering over a dot shows the best estimate (from that study) of the proportion of people who have antibodies. The purpose of these serosurveys is to estimate how far cities, provinces, territories and the entire country are to herd immunity.
Seroprevalence studies in Canada by study date and population sample frame: This graph shows the dates and population for each study examining antibody levels in Canada. Percentages at the side of each bar indicate the proportion of people who were found to have antibodies to SARS-CoV-2 in that study. There is a wide range of estimates going from 0.4% to 39% depending on the population included. Hovering over each bar provides more details of the study.
Seroprevalence estimates by Canadian population sample frame: This graph shows results by the type of population included in the study. Hovering over a box will show the median proportion of antibodies, as well as the minimum and maximum values found for each type of population. Each dot represents an estimate from a study, hence many dots may be from the same study but each dot represents antibody levels in a specific subpopulation. Among studies that included blood donors, residual blood samples, and household and community samples, the median proportion of antibodies was similar (from 1 to 1.8%).
Seroprevalence estimates by Canadian location: This graph shows studies by province or territory as well as national studies. Hovering over a box will show the median proportion of antibodies, as well as the minimum and maximum values found for each province or territory. Each dot represents an estimate from a study, hence many dots may be from the same study but each dot represents antibody levels in a specific subpopulation. This graph allows the user to adjust the date range (when the study was conducted), risk of bias (how reliable the results are), type of population, and level at which the study was conducted (local, regional, national).
Canadian general population seroprevalence estimates over time by province / territory: This graph shows studies that included the general population by study date and province. If studies repeated measurements at different time points, we can see how the proportion of people with antibodies changes over time.