Table 2. Percent of stools tested found positive for various helminth eggs. Positive Trichuris A. Ascaris Hookworm Negative No. tested Percent of total group tested Rongelap Atoll, 1977-1979, Group aged 2-14 years (estimated total persons = 106) Jun 77 80.2 38.5 1.0 15.6 96 90 Jan 22.7 3.4 0.0 76.1 88 83 Sep Rx (Jun) Rx (Sep) 78 Rx (Jan) 78 20.0 4.6 0.0 76.9 65 6l Sep 79 68.2 22.7 0.90 18.2 22 21 B. Jun Rongelap Atoll, 1977-1979, Group aged >15 years (estimated total persons = 74) 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, persons = 136) Mar 78 Rx (Mar) Sep 1978-1979, Group aged 2-14 years (estimated total 100 44.9 0 0 29 21 78 97.0 23.4 0 1.6 64 46 Sep 79 96.4 18.8 3.7 3.7 53 39 D. Rx (Sep) Rx (Jan) Utirik Atoll, persons = 128) 1978-1979, Group aged >15 years (estimated total Mar 78 83.9 10.8 5.4 16.2 37 29 Sep 78 88.5 11.5 3.8 7.7 26 20 79 92.4 15.4 0 7.7 26 20 sep Rx (Mar) Rx (Sep) Rx (Jan) - 39 -