From each of the three stool samples per child, approximately1 g was preserved in 15 ml sodium acetate–acetic acid–formalin (SAF) fixative for analysis by formalin–ether concentration technique (FECT)(Marti andEscher,1990). Four weeks after collection, the fixed samples were processed and examined under a light microscope (magnification1000×) for intestinal helminthes and protozoa.