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Volume 29, Number 10—October 2023
Research

Emergence of SARS-CoV-2 Delta Variant and Effect of Nonpharmaceutical Interventions, British Columbia, Canada

Y.L. Elaine ChanComments to Author , Michael A. Irvine, Natalie Prystajecky, Hind Sbihi, Marsha Taylor, Yayuk Joffres, Andrea Schertzer, Caren Rose, Louise Dyson, Edward M. Hill, Michael Tildesley, John R. Tyson, Linda M.N. Hoang, and Eleni Galanis
Author affiliations: British Columbia Centre for Disease Control, Vancouver, British Columbia, Canada (Y.L.E. Chan, M.A. Irvine, N. Prystajecky, H. Sbihi, M. Taylor, Y. Joffres, A. Schertzer, C. Rose, J.R. Tyson, L.M.N. Hoang, E. Galanis); Public Health Agency of Canada, Ottawa, Ontario, Canada (Y.L.E. Chan, A. Schertzer); Simon Fraser University, Burnaby, British Columbia, Canada (M.A. Irvine); University of British Columbia, Vancouver (N. Prystajecky, H. Sbihi, C. Rose, L.M.N. Hoang, E. Galanis); University of Warwick, Coventry, UK (L. Dyson, E.M. Hill, M. Tildesley); Joint UNIversities Pandemic and Epidemiological Research (L. Dyson, E.M. Hill, M. Tildesley)

Main Article

Figure 1

Percentage of COVID-19 cases by SARS-CoV-2 VOC lineage (A) and by known versus unknown lineage (B) reported in British Columbia, Canada, by epidemiologic week of specimen collection, March 1–June 30, 2021 (n = 66,247). Data are incomplete for epiweeks 9 and 26 because of study period date cutoffs. Beta VOC cases are not displayed in the top panel but are accounted for in the rounded percentages; Beta VOC cases did not account for >20 cases (<1% of cases with known lineage) per week in BC during the study period. COVID-19 cases of unknown lineage included cases with samples that did not undergo targeted VOC single-nucleotide variant (SNV) quantitative PCR (qPCR) screening or whole-genome sequencing (WGS), were negative or indeterminate on VOC SNV qPCR screening and did not undergo WGS, or did not undergo VOC SNV qPCR screening and failed WGS. VOC, variant of concern.

Figure 1. Percentage of COVID-19 cases by SARS-CoV-2 VOC lineage (A) and by known versus unknown lineage (B) reported in British Columbia, Canada, by epidemiologic week of specimen collection, March 1–June 30, 2021 (n = 66,247). Data are incomplete for epiweeks 9 and 26 because of study period date cutoffs. Beta VOC cases are not displayed in the top panel but are accounted for in the rounded percentages; Beta VOC cases did not account for >20 cases (<1% of cases with known lineage) per week in BC during the study period. COVID-19 cases of unknown lineage included cases with samples that did not undergo targeted VOC single-nucleotide variant (SNV) quantitative PCR (qPCR) screening or whole-genome sequencing (WGS), were negative or indeterminate on VOC SNV qPCR screening and did not undergo WGS, or did not undergo VOC SNV qPCR screening and failed WGS. VOC, variant of concern.

Main Article

Page created: August 07, 2023
Page updated: September 20, 2023
Page reviewed: September 20, 2023
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