1 INTRODUCTION. Schistosomiasis is the second most important parasitic infection in the world after malaria with an estimated 250 million people being infected and approximately 800 million people at risk of infection. 1 Schistosomiasis or Bilharzia is caused by schistosomes, which are parasitic trematode worms of the genus Schistosoma.Two thirds of the cases of schistosomiasis in sub-Saharan ....