There were 293 primary school children of the Kecamatan Bubutan Surabaya, whose stools have examined using the Direct and Concentration methods which showed positive results as the following: 1). Ascaris lumbricoides 10 (3.4 percent) 2). Hookworm 3 (1 percent) 3). Trichuris trichiura 14 (4.8 percent) 4). Strongyloides stercoralis 0 (0 percent). By using the APCM method on the fourth day positiv…