Table 2 Summaryof Positive Serologic Tests for Hepatitis B Surface Antigen (HBsAg), Antibody to Surface Antigen, and Antibody to Core Antigen Among 314 Marshallese Number Tested By sex Male One or More Positive Tests HBsAg Positive 20 (14.9) 134 123 (91.8)* Female 180 165 (91.7) 16 ( 8.9) Combined 314 288 (91.7) 36 (11.5) 46 175 93 43 (93.5) 158 (90.3) 87 (93.3) 3 ( 6.5) 20 (11.4) 13 (14.0) By age (yr) < 29 29-49 > 49 By atoll of residence ** Kwajalein 100 89 (89.0) 10 (10.0) Majuro 74 68 (91.9) 4 ( 5.4) Rongelap Utirik 61 76 58 (95.1) 70 (92.1) 3 ( 8.5) 19 (25.0) 61 112 95 50 (82.0) 103 (92.0) 86 (90.5) 2 ( 3.3) 21 (18.8) 10 (10.5) By radiation exposure group Rongelap exposed Utink exposed Rongelap comparison By atoll of residence, excluding Rongelap exposed Ebeye Majuro Rongelap Utinik 69 61 44 76 63 58 42 70 (91.3) (95.1) (95.5) (92.1) 6 4 3 19 ( 8.7) ( 6.6) ( 6.8) (25.0) * Percent of the total population tested is shown in parentheses. ** Three persons resided outside the atolls listed. Table 3 Skin Test Responsiveness by Radiation Exposure Group* Radiation Category Rongelap Utirik Comparison No. in Each Category No. Tested 62 38 16 (42.1%) 2 (5.3%)** 137 72 39 (54.2%) 0 (0.0%) 135 68 Tuberculin Negative 35 (51.5%) Candida Negative 2 (2.9%) * See text for definition of positive and negative tests. ** Two persons, an 83-year-old Rongelap exposed man and a 43-year-old unexposed woman, had positive tuberculin tests despite negative reactions to Candida antigen.