Stool parasite examination: The community health workers will collect stool samples for qualitative and quantitative intestinal parasite measurement at every three months interval. The stool will be examined by conventional microscopy for qualitative measurement and for quantitative measurement of intestinal helminthes by Kato-Katz or Formalin-ether concentration technique will be used. (32).E. histolytica will be detected by stool microscopy and ELISA as described by R Haque el at(33).