Further simulations were used to assess quantitatively the performance of our method at uncovering ancestries from genetic outbreak data. Most satisfyingly, our results indicated that the true ancestral haplotype was successfully retrieved in 93% of cases on average throughout all simulations (CI 99% ¼ [92.2-93.7%]; Figure 4 ). The correct location of the ancestor was also inferred in a majority of cases, although more frequently under source and sink dynamics than under homogeneous dispersal (76 and 71%, respectively; t ¼ 3.34, df ¼ 115, P ¼ 1.1 Â 10 À3 ; Figure 4 ).