Fig. 3
From: Efficient national surveillance for health-care-associated infections
a. Sentinel surveillance system performance. Average detection time of a novel HCAI, following emergence in a single randomly selected hospital versus number of hospitals participating in surveillance. The solid black line corresponds to the gold standard ‘greedy’ algorithm; the coloured points indicate the average detection time after including all hospitals in that particular list. Dashed coloured lines are plotted as reference lines. b. As 3a but showing the average number of affected hospitals