These are estimates of seroprevalence from Canadian Blood Services for the months of October and November 2020. The table below presents the estimated seroprevalence rates for Canada and the provinces served by CBS for the periods May-July, October, and November 2020. In Quebec, the serosurvey by Héma-Québec sampled once in 2020 during the first wave.
Table 1: Rate of antibody detection in Blood Donors in Canada
Values % (95% confidence Interval)
Values % (95% confidence Interval)
Values % (95% confidence Interval)
Dates
May-July
October
November
Canada
0.70% (0.63-0.77)
0.88% (0.73-1.04)
1.51% (1.31-1.71)
British Columbia
0.56% (0.41-0.70)
0.86% (0.50-1.23)
1.51% (1.04-1.97)
Alberta
0.48% (0.33-0.62)
0.76% (0.38-1.14)
1.79% (1.24-2.34)
Saskatchewan
0.53% (0.23-0.83)
0.17% (0.00-0.59)
4.17% (2.57-5.77)
Manitoba
0.59% (0.30-0.88)
2.96% (1.70-4.23)
8.56% (6.51-10.62)
Ontario
0.88% (0.78-0.99)
0.87% (0.65-1.08)
0.77% (0.56-0.97)
Quebec*
1.06% (0.82-1.30)
New Brunswick
0.23% (0.00-0.49)
0.17% (0.00-0.66)
0.49% (0.00-1.20)
Nova Scotia
0.69% (0.33-1.05)
0.98% (0.11-1.85)
0.19% (0.00-0.65)
Prince Edward Island
0.04% (0.00-0.42)
0%
0%
Newfoundland
0.44% (0.04-0.84)
0.06% (0.00-0.52)
0.95% (0.00-2.09)
*A Héma-Québec study revealed this seroprevalence in Quebec, with blood samples collected between May 25 and July 9.
