tetano
Editor, Senior Moderator
Emerg Infect Dis
. 2024 May;30(5):956-967.
doi: 10.3201/eid3005.230482.
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
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 (R[SUB]t[/SUB]) 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. R[SUB]t[/SUB] 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]). Initiating public health interventions was associated with lower R[SUB]t[/SUB] and relaxing restrictions and emergence of new variants associated with increases in R[SUB]t[/SUB].
Keywords: COVID-19; Canada; SARS-CoV-2; coronavirus disease; epidemiology; infectious diseases; reproduction number; respiratory infections; transmission; viruses; zoonoses.
. 2024 May;30(5):956-967.
doi: 10.3201/eid3005.230482.
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
- PMID: 38666622
- DOI: 10.3201/eid3005.230482
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 (R[SUB]t[/SUB]) 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. R[SUB]t[/SUB] 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]). Initiating public health interventions was associated with lower R[SUB]t[/SUB] and relaxing restrictions and emergence of new variants associated with increases in R[SUB]t[/SUB].
Keywords: COVID-19; Canada; SARS-CoV-2; coronavirus disease; epidemiology; infectious diseases; reproduction number; respiratory infections; transmission; viruses; zoonoses.