Canadian SARS-CoV-2 serological survey using antenatal serum samples: a retrospective seroprevalence study

Abstract

These results indicate widespread vulnerability to SARS-CoV-2 infection before vaccine availability in Canada. During the time periods sampled, public health tracking systems were under-reporting infections, and seroprevalence results during the Omicron period indicate extensive community spread of SARS-CoV-2 infection.