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

Chan, Y.L. Elaine; Irvine, Michael A.; Prystajecky, Natalie; Sbihi, Hind; Taylor, Marsha; Joffres, Yayuk; Schertzer, Andrea; Rose, Caren; Dyson, Louise; Hill, Edward M.; Tildesley, Michael; Tyson, John R.; Hoang, Linda M.N.; Galanis, Eleni

doi:10.3201/eid2910.230055

i

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

Supporting Files Public Domain

10 2023
By Chan, Y.L. Elaine ; Irvine, Michael A. ; Prystajecky, Natalie ; ...

File Language:

English

Details

Alternative Title:

Emerg Infect Dis
Personal Author:

Chan, Y.L. Elaine ; Irvine, Michael A. ; Prystajecky, Natalie ; Sbihi, Hind ; Taylor, Marsha ; Joffres, Yayuk ; Schertzer, Andrea ; Rose, Caren ; Dyson, Louise ; Hill, Edward M. ; Tildesley, Michael ; Tyson, John R. ; Hoang, Linda M.N. ; Galanis, Eleni
Description:

In British Columbia, Canada, initial growth of the SARS-CoV-2 Delta variant was slower than that reported in other jurisdictions. Delta became the dominant variant (>50% prevalence) within ≈7-13 weeks of first detection in regions within the United Kingdom and United States. In British Columbia, it remained at <10% of weekly incident COVID-19 cases for 13 weeks after first detection on March 21, 2021, eventually reaching dominance after 17 weeks. We describe the growth of Delta variant cases in British Columbia during March 1-June 30, 2021, and apply retrospective counterfactual modeling to examine factors for the initially low COVID-19 case rate after Delta introduction, such as vaccination coverage and nonpharmaceutical interventions. Growth of COVID-19 cases in the first 3 months after Delta emergence was likely limited in British Columbia because additional nonpharmaceutical interventions were implemented to reduce levels of contact at the end of March 2021, soon after variant emergence.
Subjects:

Emergence Of SARS-CoV-2 Delta Variant And Effect Of Nonpharmaceutical Interventions, British Columbia, Canada Research
Keywords:

B.1.617.2 SARS-CoV-2 Variant British Columbia Canada Communicable Disease Control COVID-19 Disease Transmission Humans Infectious Physical Distancing Public Health Respiratory Infections Retrospective Studies SARS-CoV-2 SARS-CoV-2 Delta Variant Vaccination Viruses Zoonoses
Source:

Emerg Infect Dis. 2023; 29(10):1999-2007
Pubmed ID:

37640374
Pubmed Central ID:

PMC10521616
Document Type:

Journal Article
Volume:

29
Issue:

10
Collection(s):

Emerging Infectious Diseases
Main Document Checksum:

urn:sha256:c89742ae8a23b15ca5af811bf179d71745aad06b54920c1521d292bfffcdd8fd
Download URL:

https://stacks.cdc.gov/view/cdc/134743/cdc_134743_DS1.pdf
File Type:

[PDF - 1.71 MB ]

File Language:

English

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