Changes in prevalence, intensity of infection and morbidity due to Schistosoma japonicum infection in a community following a single treatment with praziquantel.

A repeat survey for schistosomiasis japonica was carried out in Sisan community 1 year after chemotherapy with praziquantel was stopped. Prevalence of infection had fallen from 43.7 to 10.2%, intensity (population geometric mean) had dropped from 6.3 to 0.6 eggs per gram of stool and morbidity decreased significantly.