Reconstruction of the 2003 SARS outbreak in Singapore.

A) Circles represent individual cases, and edges the epidemiological contacts reported between them. B) The outbreak was reconstructed using temporal and genetic data. Arrows represent posterior ancestries between cases, scaled in width by the posterior frequency of that ancestry. Ancestries with a minimum posterior frequency of 0.01 were included. The color of a node corresponds to the median posterior infection time of that case. C) The outbreak was reconstructed using temporal, contact and genetic data, and the non-infectious contact probability λ fixed at a value of 1e-4. D) The outbreak was reconstructed using temporal, contact and genetic data, and the non-infectious contact probability λ fixed at a value of 0.