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SARS-CoV-2 seroprevalence among Vancouver public school staff in British Columbia, Canada: a cross-sectional study.
Goldfarb, David M; Mâsse, Louise C; Watts, Allison W; Hutchison, Sarah M; Muttucomaroe, Lauren; Bosman, Else S; Barakauskas, Vilte E; Choi, Alexandra; Dhillon, Nalin; Irvine, Michael A; Reicherz, Frederic; O'Reilly, Collette; Sediqi, Sadaf; Xu, Rui Yang; Razzaghian, Hamid R; Sadarangani, Manish; Coombs, Daniel; O'Brien, Sheila F; Lavoie, Pascal M.
  • Goldfarb DM; Department of Pathology and Laboratory Medicine, The University of British Columbia, Vancouver, British Columbia, Canada plavoie@bcchr.ca David.Goldfarb@cw.bc.ca.
  • Mâsse LC; British Columbia Children's Hospital Research Institute, Vancouver, British Columbia, Canada.
  • Watts AW; British Columbia Children's Hospital Research Institute, Vancouver, British Columbia, Canada.
  • Hutchison SM; School of Population and Public Health, University of British Columbia, Vancouver, British Columbia, Canada.
  • Muttucomaroe L; Department of Pediatrics, University of British Columbia, Vancouver, British Columbia, Canada.
  • Bosman ES; British Columbia Children's Hospital Research Institute, Vancouver, British Columbia, Canada.
  • Barakauskas VE; Department of Pediatrics, University of British Columbia, Vancouver, British Columbia, Canada.
  • Choi A; British Columbia Children's Hospital Research Institute, Vancouver, British Columbia, Canada.
  • Dhillon N; Department of Pediatrics, University of British Columbia, Vancouver, British Columbia, Canada.
  • Irvine MA; British Columbia Children's Hospital Research Institute, Vancouver, British Columbia, Canada.
  • Reicherz F; Department of Pediatrics, University of British Columbia, Vancouver, British Columbia, Canada.
  • O'Reilly C; Department of Pathology and Laboratory Medicine, The University of British Columbia, Vancouver, British Columbia, Canada.
  • Sediqi S; British Columbia Children's Hospital Research Institute, Vancouver, British Columbia, Canada.
  • Xu RY; Office of the Medical Health Officer, Vancouver Coastal Health Authority, Vancouver, British Columbia, Canada.
  • Razzaghian HR; Office of the Medical Health Officer, Vancouver Coastal Health Authority, Vancouver, British Columbia, Canada.
  • Sadarangani M; British Columbia Centre for Disease Control, Vancouver, British Columbia, Canada.
  • Coombs D; Faculty of Health Sciences, Simon Fraser University, Burnaby, British Columbia, Canada.
  • O'Brien SF; British Columbia Children's Hospital Research Institute, Vancouver, British Columbia, Canada.
  • Lavoie PM; Department of Pediatrics, University of British Columbia, Vancouver, British Columbia, Canada.
BMJ Open ; 12(4): e057846, 2022 04 05.
Article in English | MEDLINE | ID: covidwho-1962255
ABSTRACT

OBJECTIVES:

Few studies reported COVID-19 cases in schools during the 2020/21 academic year in a setting of uninterrupted in-person schooling. The main objective was to determine the SARS-CoV-2 seroprevalence among school staff in Vancouver public schools.

DESIGN:

Cumulative incident COVID-19 cases among all students and school staff based on public health data, with an embedded cross-sectional serosurvey among a school staff sample that was compared to period, age, sex and geographical location-weighted data from blood donors.

SETTING:

Vancouver School District (British Columbia, Canada) from kindergarten to grade 12.

PARTICIPANTS:

Active school staff enrolled from 3 February to 23 April 2021 with serology testing from 10 February to 15 May 2021. MAIN OUTCOME

MEASURES:

SARS-CoV-2 seroprevalence among school staff, based on spike (S)-based (unvaccinated staff) or N-based serology testing (vaccinated staff).

RESULTS:

Public health data showed the cumulative incidence of COVID-19 among students attending in-person was 9.8 per 1000 students (n=47 280), and 13 per 1000 among school staff (n=7071). In a representative sample of 1689 school staff, 78.2% had classroom responsibilities, and spent a median of 17.6 hours in class per week (IQR 5.0-25 hours). Although 21.5% (363/1686) of surveyed staff self-reported close contact with a COVID-19 case outside of their household (16.5% contacts were school-based), 5 cases likely acquired the infection at school based on viral testing. Sensitivity/Specificity-adjusted seroprevalence in 1556/1689 staff (92.1%) was 2.3% (95% CI 1.6% to 3.2%), comparable to a sex, age, date and residency area-weighted seroprevalence of 2.6% (95% CI 2.2% to 3.1%) among 5417 blood donors.

CONCLUSION:

Seroprevalence among staff was comparable to a reference group of blood donors from the same community. These data show that in-person schooling could be safely maintained during the 2020/21 school year with mitigation measures, in a large school district in Vancouver, Canada.
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Full text: Available Collection: International databases Database: MEDLINE Main subject: SARS-CoV-2 / COVID-19 Type of study: Observational study / Prognostic study / Randomized controlled trials Topics: Vaccines Limits: Humans Country/Region as subject: North America Language: English Journal: BMJ Open Year: 2022 Document Type: Article

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Full text: Available Collection: International databases Database: MEDLINE Main subject: SARS-CoV-2 / COVID-19 Type of study: Observational study / Prognostic study / Randomized controlled trials Topics: Vaccines Limits: Humans Country/Region as subject: North America Language: English Journal: BMJ Open Year: 2022 Document Type: Article