Thediseaseisonlyendemictosubtropicalandtropicalregionsandismainly a ruralproblem.
この病気は亜熱帯および熱帯地域だけの風土病で、主に農村部の問題である。
Itaffectsmostlythosewhoareunabletoavoidcontactwithwater, eitherbecauseoftheirprofession, agricultureorfishing, orbecauseof a lackof a reliablesourceofsafewaterfordrinking, washingorbathing.
Inareasthataremostseverelyaffected, likenortheasternBrazilandmuchofsub-SaharanAfrica, theworkingabilityoflargeportionsofthepopulationisseverelyreducedas a That's why, inthepastfewdecades, healthorganizationshavebeguntoworkrelentlesslyonlimitingtheimpactofschistosomiasis, buttheprocessisdifficultandcomplexandwhilesuccessfulinsomeregions, on a globalscaleitwasrelativelyunsuccessfulthusfar.
Eachcontrolmeasuremustthereforebeappliedandadaptedspecificallyforeachareatobeaffected, whichexplainswhytheeliminationofschistosomiasisissuch a challenge.
In 1970, after 50 yearsofcontinuouseffort, thenumberofinfectionshadbeenreducedfromaround 10,000 to a fewhundred, andnonewcaseshavebeenreportedsince 1977.