Two stool samples were collected from each child two days apart and analyzed using the gravitational sedimentation and Kato-Katz [45] techniques to detect eggs of A. lumbricoides, T. trichiura, hookworms and S. mansoni. Because hookworm (0.1%), Enterobius vermiculares (1.4%), Strongyloides stercoralis (0%) and S. mansoni (0%), were rare or absent in the study population, they were excluded from the analysis and only A. lumbricoides and T. trichiura were considered in the
present analysis