2.

Summary of the proportions of cases detected by the measure from observational studies. Measures portrayed include exit and/or entry screening (top panel) and PCR tests (middle panel), as well as for combined measures exit and/or entry screening with quarantine and further screening, in the form of symptom observation and/or PCR tests (bottom panel).

Notes:

Yamahata 2020 employed a form of symptom screening aboard a cruise ship, thus representing a very different context than all other studies.

Ng 2020 employed a delayed PCR test on day 3.

Lagier 2020 and Lio 2020 employed a PCR test on arrival and on day 2, respectively, however given that they did not identify cases they are not portrayed in this figure.

The five evacuation flights assessed in Shaikh Abdul Karim 2020 had very different COVID‐19 prevalences, with no cases associated with three flights, but with 2/104 and 80/124 on the remaining two flights.