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1
Japan began implementing COVID-19 travel restrictions in February 2020, initially refusing entry to certain travelers linked to Hubei Province, China.
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2
By early April 2020, Japan had expanded the number of countries from which travelers were refused entry to 73, while permitted entrants underwent airport screening and quarantine measures.
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3
From January 9, 2021, through May 31, 2022, all travelers entering Japan were screened and tested for SARS-CoV-2.
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4
The study used entry-screening data and counterfactual travel-volume scenarios to estimate the impact of reduced travel on imported SARS-CoV-2 infections in Japan.
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5
Japan’s lack of international land-based transport provided an opportunity to estimate imported COVID-19 infections associated with international travel.
