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

International Journal of Infectious Diseases（2021）

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摘要

•COVID-19 case fatality rate decreased profoundly during the second wave period.•There was substantial variation in the magnitude of the decrease across regions.•The COVID-19 testing percentage is not a driving factor for the decrease.

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