Figure 2From: Onset of a pandemic: characterizing the initial phase of the swine flu (H1N1) epidemic in Israel "Birthright" influence on spread. Influence of the group of young American students (from the "Birthright" project) on time series of swine flu cases in Israel. The dashed line shows all the cases that were either group members or identified themselves as being in contact with the "Birthright" group. The solid line displays the rest of the cases.Back to article page