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Simulating the Impacts of Interregional Mobility Restriction on the Spatial Spread of COVID-19 in Japan

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  • KONDO Keisuke

Abstract

This study develops a spatial Susceptible–Exposed–Infectious–Recovered (SEIR) model that analyzes the effect of interregional mobility on the spatial spread of the coronavirus disease 2019 (COVID-19) outbreak in Japan. National and local governments have requested that residents refrain from traveling between 47 prefectures during the state of emergency. However, the extent to which restricting the interregional mobility prevents infection expansion has not been elucidated. Our spatial SEIR model describes the spatial spread pattern of COVID-19 when people commute to a prefecture where they work or study during the daytime and return to their residential prefecture at night. We assume that people are exposed to infection risk during their daytime activities. According to our simulation results, interregional mobility restriction can prevent geographical expansion of the infection. However, in prefectures with many infectious individuals, residents are exposed to higher infection risk when their mobility is restricted. Our simulation results also show that interregional mobility restriction plays a limited role in reducing the national total number of infected individuals.

Suggested Citation

  • KONDO Keisuke, 2020. "Simulating the Impacts of Interregional Mobility Restriction on the Spatial Spread of COVID-19 in Japan," Discussion papers 20089, Research Institute of Economy, Trade and Industry (RIETI).
    • Handle: RePEc:eti:dpaper:20089
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    File URL: https://www.rieti.go.jp/jp/publications/dp/20e089.pdf
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    1. Tsutomu Watanabe & Tomoyoshi Yabu, 2020. "Japan’s Voluntary Lockdown," CARF F-Series CARF-F-492, Center for Advanced Research in Finance, Faculty of Economics, The University of Tokyo.
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