Figure 3
From: Assessing the role of contact tracing in a suspected H7N2 influenza A outbreak in humans in Wales
Actual and idealised time courses of treatment and tracing. Time course of tracing and treatment/prophylaxis during the outbreak (blue). Also shown are two idealised situations: one - instantaneous tracing (green) - in which tracing and treatment/prophylaxis take place immediately a contact is named; the other (red) in which there is both instantaneous tracing and perfect surveillance, such that as soon as individuals become symptomatic they are treated and their contacts are identified and traced.