Contact tracing. (A) Probabilities of detecting first and second generation cases (the latter conditioned to the detection of first generation cases) triggered by a traced index case. (B) Example of network of cases triggered by the initial infected laboratory worker (undetected in this example; the initial warning is triggered by a secondary case in the laboratory), and probability of case detection at time of intervention (Tw + Ti).
Merler et al. BMC Medicine 2013 11:252 doi:10.1186/1741-7015-11-252