Table 2. Percent of stools tested found positive for various helminth eggs. Positive Trichuris A. Rongelap Atoll, persons = 106) Jun 77 Rx (Jun) . Rx (Sep) Ascaris Hookworm Negative’ No. tested Percent of total group tested 1977-1979, Group aged 2-14 years (estimated total 80.2 . 38.5 1.0 15.6 96 390 Jan 78 22.7 3.4 0.0 76.1 88 83 Sep 78 Sep 79 20.0 68.2 4.6 22.7 0.0 0.0 76.9 18.2 65 22 61 21 Rx (Jan) B. Rongelap Atoll, 1977-1979, Group aged >15 years (estimated total persons = 74) Jun 77 62.4 4.4 2.9 34.3 67 90 Jan 78 8.6 0.0 0.0 91.3 58 78 Sep 78 Sep 79 2.3 12.5 2.3 6.2 0.0 0.0 92.8 75.0 42 16 57 22 Rx (Jun) Rx (Sep) Rx (Jan) C. Utirik Atoll, 1978-1979, Group aged 2-14 years (estimated total persons = 136) Mar 78 Rx (Mar) Sep 78 Rx (Sep) 100 44.9 0 0 29 21 97.0 23.4 0 1.6 64 46 96.4 18.8 3.7 3.7 53 39 . Rx (Jan) Sep 79 D. Utirik Atoll, 1978-1979, Group aged >15 years (estimated total persons = 128) Mar 78 83.9 10.8 5.4 16.2 37 29 Sep 78 Rx (Sep) 88.5 11.5 3.8 7.7 26 20 92.4 15.4 0 7.7 26 20 Rx (Mar) Rx (Jan) Sep 79 - 39 -