Migration pattern of HAV genotype IA circulation in Tunisia. The bubblegram shows the frequency of gene flow (migrations) in Tunisia to/from different geographic areas (towns). The surface of each circle is proportional to the percentage of observed migrations in the ML genealogy. Migrations were inferred with a modified version of the Slatkin and Maddison algorithm [25,26] for the HAV subtype IA from the maximum likelihood inferred genealogies given in Figure 2. A: Sfax; B: Sousse; C: Mahdia; D: Monastir; E: Tunis; F: Kairouan.