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JDR Vol.17 No.1 pp. 57-60
(2022)
doi: 10.20965/jdr.2022.p0057

Paper:

Huge Excess Mortality Due to the Delta Strain of COVID-19 in Japan in August 2021

Junko Kurita*, Tamie Sugawara**,†, and Yasushi Ohkusa**

*Department of Nursing, Tokiwa University
1-430-1 Miwa, Mito, Ibaraki 310-8585, Japan

**Infectious Disease Surveillance Center, National Institute of Infectious Diseases (NIID), Tokyo, Japan

Corresponding author

Received:
October 27, 2021
Accepted:
December 8, 2021
Published:
January 30, 2022
Keywords:
excess mortality, delta strain, COVID-19, all cause death, stochastic frontier estimation
Abstract

Background: No remarkable excess mortality attributable to COVID-19 has been observed in Japan until the delta strain of COVID-19 emerged. Object: We sought to quantify high pathogenicity of the delta strain using the National Institute of Infectious Diseases (NIID) model. Method: We applied the NIID model to deaths of all causes from 1987 up through August 2021 for the whole of Japan. Results: Results in Japan show 4105 excess mortality in August 2021 in Japan. It was estimated as 3.8% of the baseline. Discussion and Conclusion: We found substantial excess mortality since the outbreak of COVID-19 had emerged in August 2021, in Japan. It might be due to spread of delta strain at that time.

Cite this article as:
J. Kurita, T. Sugawara, and Y. Ohkusa, “Huge Excess Mortality Due to the Delta Strain of COVID-19 in Japan in August 2021,” J. Disaster Res., Vol.17, No.1, pp. 57-60, 2022.
Data files:
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Last updated on Sep. 26, 2022