In a paper published in Microbiology Spectrum, researchers with Canadian Blood Services (CBS) point to the changing patterns of infection-acquired and vaccine-induced seroprevalence, observed between January and November 2021.
Infection-acquired seropositivity increased throughout February 2022, averaging out to 23.7% for the month - double January’s rate of 12.1% - according to data from Canadian Blood Services.
In its latest report, Canadian Blood Services revealed the toll of Omicron’s spread through mid-February 2022. Not only did 22.7% of all blood donors experience a prior SARS-CoV-2 infection, but this rate represented a 35% jump during the 22-day sampling period (January 24 – February 15).
Published in Frontiers in Public Health, the CARTaGENE research team, based at the Research Center at the Centre Hospitalier Universitaire Sainte-Justine and part of the CITF-funded CanPATH study, found that vaccination hesitancy among adults in Quebec was correlated with education levels, age and other socio-demographic determinants.
Most Canadian blood donors exhibited some form of immunity against SARS-CoV-2 in January 2022, primarily due to vaccination. Nonetheless, infection-acquired seroprevalence increased sharply between December 2021 and the end of January 2022, nearly tripling from 6.4% to 16.3%. Almost a quarter of donors aged 17-24 were seropositive for infection-acquired antibodies (22.2%). Key findings: Nearly [...]
In the first of a series of biweekly reports, the Canadian Blood Services revealed Omicron’s traction in December 2021. While all blood donors tested positive for the spike (S) protein, primarily due to immunization, infection-acquired seropositivity (as evidenced by anti-N IgG antibodies) climbed from 7.5% to 10.1 % from December 25, 2021 to [...]
This study, published in Microbiology Spectrum and carried out by CITF-funded researchers Drs. Steven Drews and Sheila O’Brien of Canadian Blood Services, characterized the neutralization capacity and the breadth of protection against SARS-CoV-2 and its variants of concern (Alpha, Beta, Gamma, and Delta).
The latest report from Canadian Blood Services, covering the early days of the Omicron wave, shows that, notwithstanding the nearly universal presence of anti-SARS-CoV-2 antibodies among blood donors, the number of donors who had antibodies due to prior infection rose. Key findings: The proportion of donors with evidence of a prior infection was 6.4% [...]
Remarkably, nearly all Canadian Blood Services blood donors sampled in November tested positive for antibodies against the SARS-CoV-2 spike protein. While this was mainly due to vaccination with at least one vaccine dose, seroprevalence from a prior infection with COVID-19 stood at 5.1%, higher than what was seen in previous months. In a subset [...]
The latest Canadian Blood Services (CBS) report, from October 2021, indicates that 98% of blood donors sampled had antibodies to SARS-CoV-2. This number is largely driven by immunization with at least one vaccine dose, as infection-acquired seroprevalence stayed low, at 4.3%. Results also reveal a downward trend in the mean levels of antibodies across [...]