W.H. ADAMS: LATE MEDICAL CONSEQUENCES OF EXPOSURE TO RADIOACTIVE HEMATOCRIT -MALES 120+ TTT TTT TTT Tt 110} 100 90r Te Lo wee u ead TT A B0r | \v A & 4 5 le 3 4 1 2 120b 3 Or Le ; 2 90+ ©uJ 80h ; 1 : © _ 100} a uu U Loma "4 Y 4 i2OF 4 1lOF 7 390r 80 4 ppd ppd pp te te et kt 2 4 6 tk kh 8 IO !2 [4 16 IB 20 22 24 26 28 30 YEARS POST -EXPOSURE Figure 3. The mean hematocrit, a measure of the degree of anemia in a community, has shown no significant variation from control values. Top - Rongelap; middle - Ailingnae; bottom - Utirik. individuals have had a clinically significant depression of any cell type (8). Hemoglobin/hematrocrit levels have been virtually identical to the unexposed (Figure 3). Immunologic Status In 1957 the first of several tests for evaluating the immune function of exposed Marshailese was performed (16). The serologic responses to primary and secondary challengesof tetanus toxoid were found notto be significantly different between exposed and unexposed persons, although the range of titers was great, the numberof persons tested was small, and the primary response was somewhat lower in the exposed. In 1959 complementfixation tests for a battery of viral and rickettsial disease (including influenza, mumps, and adenovirus) were performed. The Rongelap group had lower meantiters than the comparison group for most antibodies tested, Nosignificant 276