Fig. 4.

Variations in the infection of S. japonicum in Bohol (Sto. Thomas) for the human-control case with selective mass treatment at 1-year interval with a coverage rate of 50% (solid line), the snail-control case with the use of molluscicides at half-year intervals under the assumption that its effective rate would be 50% (dotted line), and both the human and snail-control case (dashed line), respectively. (A) Variations in prevalence (%) in the human population, (B) Variations in infected snail densities per 1 a (100 m²) [4].