Table 2. Percent of stools tested found positive for various helminth eggs. Positive Trichuris A. Hookworm Negative’ tested Percent of total group tested Rongelap Atoll, 1977-1979, Group aged 2-14 years (estimated total persons = 106) Jun 77 Rx (Jun) 80.2 Rx (Sep) Jan 78 Rx (Jan) Sep 78 Sep 79 B. Ascaris No. Rongelap Atoll, persons = 74) Jun 77 Rx (Jun) 1.0 3.4 4.6 22.7 96 90 0.0 88 83° 0.90 0.0 65 22 61 21 15.6 1977-1979, Group aged >15 years (estimated total 62.4 Rx (Sep) Jan 78 Rx (Jan) Sep 78 Sep 79 38.5 12.5 67 90 0.0 58 78 0.0 0.0 42 16 57 22 4.4 2.9 0.0 2.3 6.2 34.3 Utirik Atoll, 1978-1979, Group aged 2-14 years (estimated total persons = 136) Mar 78 Rx (Mar) Sep 78 Rx (Sep) Rx (Jan) Sep 79 100 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 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 Sep 79 92.4 15.4 0 7.7 26 20 Rx (Mar) Rx (Jan) - 39 -