SARS-CoV-2 Transmission in Alberta, British Columbia, and Ontario, Canada, January 2020-January 2022

Aubrey D. Kehoe, Arshpreet Kaur Mallhi, Charles R. Barton, Hunter M. Martin, Christopher M. Turner, Xinyi Hua, Kin On Kwok, Gerardo Chowell, Isaac Chun Hai Fung

Research output: Contribution to journalArticlepeer-review

Abstract

We estimated COVID-19 transmission potential and case burden by variant type in Alberta, British Columbia, and Ontario, Canada, during January 23, 2020-January 27, 2022; we also estimated the effectiveness of public health interventions to reduce transmission. We estimated time-varying reproduction number (Rt) over 7-day sliding windows and nonoverlapping time-windows determined by timing of policy changes. We calculated incidence rate ratios (IRRs) for each variant and compared rates to determine differences in burden among provinces. Rt corresponding with emergence of the Delta variant increased in all 3 provinces; British Columbia had the largest increase, 43.85% (95% credible interval [CrI] 40.71%-46.84%). Across the study period, IRR was highest for Omicron (8.74 [95% CrI 8.71-8.77]) and burden highest in Alberta (IRR 1.80 [95% CrI 1.79-1.81]).

Original languageEnglish
Pages (from-to)956-967
Number of pages12
JournalEmerging Infectious Diseases
Volume30
Issue number5
DOIs
StatePublished - May 2024

Scopus Subject Areas

  • Epidemiology
  • Microbiology (medical)
  • Infectious Diseases

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