Symptomatic and asymptomatic transmission of SARS-CoV-2 in K-12 schools, British Columbia, April to June 2021

  1. Alex Choi
  2. Louise C. Mâsse
  3. Samantha Bardwell
  4. Yanjie Zhao
  5. Yang Xin Zi Xu
  6. Ani Markarian
  7. Daniel Coombs
  8. Allison Watts
  9. Adrienne Macdonald
  10. Nalin Dhillon
  11. Michael Irvine
  12. Collette O’Reilly
  13. Pascal M. Lavoie
  14. David Goldfarb
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Abstract

We prospectively studied SARS-CoV-2 transmission at schools in an era of Variants of Concern (VoCs), offering all close contacts serial viral asymptomatic testing up to 14 days. Of 229 school close contacts, 3 tested positive (1.3%), of which 2 were detected through asymptomatic testing. Most secondary transmission (90%) occurred in households. Routine asymptomatic testing of close contacts should be examined in the context of local testing rates, preventive measures, programmatic costs, and health impacts of asymptomatic transmission.

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