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The Vac-Cha group was immunized with UVAC at week 0 and challenged with normal cercariae at week 5 as well as the Inf-Con group. Triangles and arrows show the times of immunization and infection, respectively. *P<0.05 and **P<0.01 compared to the Inf-Con group. Data are representative of two independent experiments with similar results (n = 7).
