Relative risks of COVID-19 fatality between the first and second waves of the pandemic in Ontario, Canada

Sylvia H. Hsu, Su Hsin Chang, Cary P. Gross, Shi Yi Wang

Research output: Contribution to journalArticlepeer-review

Abstract

Objectives: To examine whether the case fatality rate (CFR) of COVID-19 decreased over time and whether the COVID-19 testing rate is a driving factor for the changes if the CFR decreased. Methods: Analyzing COVID-19 cases, deaths and tests in Ontario, Canada, we compared the CFR between the first wave and the second wave across 26 public health units in Ontario. We also explored whether a high testing rate was associated with a large CFR decrease. Results: The first wave CFR ranged from 0.004 to 0.146, whereas the second wave CFR ranged from 0.003 to 0.034. The pooled RR estimate of second wave COVID-19 case fatality, compared with first wave, was 0.24 (95% CI: 0.19-0.32). Additionally, COVID-19 testing percentages were not associated with the estimated relative risk (P=0.246). Conclusions: The COVID-19 CFR decreased significantly in Ontario during the second wave, and COVID-19 testing was not a driving factor for this decrease.

Original languageEnglish
Pages (from-to)189-191
Number of pages3
JournalInternational Journal of Infectious Diseases
Volume109
DOIs
StatePublished - Aug 2021

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