Figure 2. Survey locations and observed prevalence of O. viverrini infection in endemic countries of Southeast Asia.
(A) 1978–1982, (B) 1983–1987, (C) 1988–1992, (D) 1993–1997, (E) 1998–2002, (F) 2003–2007, (G) 2008–2012, and (H) 2013–2018.
(A) 1978–1982, (B) 1983–1987, (C) 1988–1992, (D) 1993–1997, (E) 1998–2002, (F) 2003–2007, (G) 2008–2012, and (H) 2013–2018.