Yamahata 2020.

Study characteristics
Study design	Observational screening study
Disease	COVID‐19
Travel‐related control measure(s)	Screening at national borders and quarantine of travellers (Diamond Princess cruise ship) Entry screening procedures: screening based on symptoms of COVID‐19 and being a close contact of someone with symptoms Quarantine procedures: Quarantine on board until first PCR test was conducted (2 to 23 days). Quarantine for 14 days of all those who tested negative Reference test: testing of all individuals on board with PCR over a 3 week period after arrival; quarantine and observation on board until first PCR test; quarantine and observation for 14 days after a negative PCR test;  PCR testing of those under quarantine showing symptoms Date of Implementation: 5 February 2020 ‐ 23 February 2020
Country implementing the measure(s)	Country protected by the measure: Japan Country restricted by the measure: n.r.
Outcome(s)	Cases detected due to the measure Outcome 1: proportion of cases detected Outcome 2: positive predictive value Follow‐up: 1 day (one time event) with follow‐up reference testing
Notes	COI: “None declared.” Funding: “The authors did not receive any funding for this study”