Lytras 2020.

Study characteristics
Study design	Observational screening study
Disease	COVID‐19
Travel‐related control measure(s)	Screening at national borders and quarantine of travellers (evaluation flights) Entry screening procedures: symptom‐based arrival screening Reference test for entry screening: PCR‐testing of passengers upon arrival; observation of passengers for 14 days (without additional PCRs) Quarantine procedures: Quarantine of all passengers tested negative for 14 days Reference test for quarantine observation: none Date of implementation: 22‐25 March 2020
Country implementing the measure(s)	Country protected by the measure: Greece Country restricted by the measure: UK, Spain, Turkey
Outcome(s)	Cases detected due to the measure Outcome 1: proportion of cases detected Outcome 2: positive predictive value Follow‐up: n.r.
Notes	COI: “None declared.” Funding: “No funding was received for this study.”