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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

Table 2

Information on country of origin for 153 SARS-CoV-2 Delta variant of concern cases reported in British Columbia, Canada, with known history of international travel in periods before and after travel ban and overall, March 1–June 30, 2021

Country of origin No. (%) Delta cases with international travel history
Pre–travel ban period* Post–travel ban󠆣 period† Overall
India 64 (50.8) 2 (7.4) 66 (43.1)
Other country 11 (8.7) 15 (55.6) 26 (17.0)
Missing information 51 (40.5) 10 (37.0) 61 (39.9)
Total for all Delta cases 126 (45.2) 27 (3.0) 153 (13.0)

*The Canadian travel ban on direct flights from India and Pakistan was implemented on the evening of April 22, 2021. Persons arriving in Canada before April 23, 2021, completed quantitative PCR testing 10 d after arrival. Therefore, pre–travel ban cases include Delta variant cases with specimen collection during March 21–May 2, 2021. †Delta variant cases with specimen collection during May 3–June 30, 2021.

Main Article

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