Expected number of infectious travellers that were released to community (A) and risk of released at least one infectious traveller to the community (B) when one on-arrival test positive in different traveller volumes. In panel A, median (thick horizontal tick), interquartile (shaded rectangles) and 95% quantiles (solid vertical lines) of 2,000 simulations were shown, while grey dashed line indicates the number of. In panel B, mean (dots) and 95% CI (vertical lines) of the probability are shown.