The distribution of S. japonicum infections over time by baseline infection status.

*Cohort 1 is composed of people from 10 villages in Xichang County where schistosomiasis was endemic. Participants were tested for S. japonicum infection in 2000 (T0), 2002 (T1) and 2006 (T2).†Cohort 2 is composed of people from 27 villages in two counties where schistosomiasis reemerged following reduction of S. japonicum infection prevalence below 1%. Participants were tested for S. japonicum infection in 2007 (T0), 2008 (T1) and 2010 (T2).