In this study partially funded by the CITF and published in Microbiology Spectrum, researchers from Alberta Precision Laboratories collected blood samples from June 2020 to January 2021 to determine the prevalence of SARS-CoV-2 antibodies in Alberta, by assessing a total of 93,993 individual patient samples. While the prevalence of antibodies in June 2020 was [...]
Latest Canadian Blood Services data show improvements in vaccine uptake and equity in vaccine coverage
The month of June saw many Canadians rolling up their sleeves for a COVID-19 vaccine. The latest results from the Canadian Blood Services’ serosurvey reflect this, with vaccine-induced seroprevalence soaring to 86% across Canada (excluding the Territories and Quebec), up from 60% the month prior. Most importantly, the gap in vaccine coverage among socioeconomic [...]
In their CITF-funded research, in preprint and not yet peer reviewed, Dr. Prabhat Jha and his team leading the Action to Beat Coronavirus (Ab-C) study estimated cumulative seroprevalence of SARS-CoV-2 through infection among unvaccinated adults rose from about 2% after the first wave to 7% after the second. The numbers were based on blood [...]
CITF-funded SeroTracker carried out a living systematic review of 968 seroprevalence studies that included 9.3 million participants in 74 countries. Their findings, published in PLOS One, suggest that the general population median seroprevalence worldwide was low (4.5%), but found important differences when comparing infection rates from diagnostic testing. In this systematic review and [...]
Interim results unveil Vancouver public school staff are not at higher risk of COVID-19 infection with mitigation measures that are in place
Drs. Pascal Lavoie and Louise C. Mâsse and their team at the University of British Columbia have released interim results, soon to be submitted for peer-review, suggesting that school staff are not at increased risk of SARS-CoV-2 infection at school, compared to in the community. The authors attribute this in part to the appropriate [...]
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 [...]
Serosurveillance survey shows SARS-CoV-2 infections growing much faster in poorer neighbourhoods and amongst racialized populations Results from the latest Canadian Blood Services/COVID-19 Immunity Task Force (CITF) collaborative nine-province seroprevalence study confirm that the pandemic is increasingly affecting poorer neighbourhoods and racialized populations. The inequalities in risk in getting COVID-19 were identified early in the pandemic [...]
View a table of Canadian seroprevalence estimates from Canadian Blood Services for May 2020 to January 2021. Links to full reports available as well.
Following Canada’s COVID-19 first wave, less than 1% of blood donors had antibodies against the virus
Results from CBS’s initial survey, conducted between May 9th and July 21st, 2020 showed that 552 of the 74,642 donors tested had detectable antibodies, which gave an adjusted seroprevalence of 7.7 per 1000 donors.
A large group of researchers found seroprevalence across Canada was low in the first wave of the pandemic but found 31% of those who tested positive for antibodies had never had symptoms. They also found the death rate in nursing homes was over 70 times greater than among elderly adults living outside of nursing homes.