Fig. 4

Cost-effectiveness Acceptability Curve of the four competing strategies: SW: swab-based strategy; SY10-17: symptoms-based strategy with swabs scheduled at 10 and 17 days; SY14-17: symptoms-based strategy with swabs scheduled at 14 and 17 days; SY17: symptoms-based strategy with one swab at 17 days. Willingness to pay (WTP) was set at 160€ with interval of 10€ and is expressed as €/WDS: working days saved