rt Table 4.7 ATLINGINAE GROUP MEAN BLOOD COUNTS AT TIMESOF PEAK Di PRIESSION W.BLC, (Average from Platelets © 103 Neutrophifes Case No. (Average from Day 39 to 51) Day 26 to 30) (Average trom Day 49 to 51) 6 9750 8 44 - . HAO 4570 ho Ly mphoeytes (Average from Dav 89 to ol) Age Less Than 5 ' 2ts . 3470 1x4 H600 2620 1x0 i. 450 2350 Be 2070 be Re! Age 6 to 15 a8 220 as HI 6170 4700 Bote “10 wo70 240 “40 3700 L820 : be poe 3150 “hoe 21y0 Bo pos Age Greater Than Lo i 1G 2k 20 31 41 43 6150 45 5650 51 7750 50 59 70 4.5 6U7G 4670 6270 6750 5650 5120 7050 12400 5070 175 195 115 115 145 110 y 3570 2200 3720 4100 2950 3050 215 2370 2270 2270 2220 2450 2270 3700 180 4170 170 4620 185 3000 95 105 r i ' 2000 i 1470 3970 b 2900 i. 2950 8120 RONGELAP GROUP . Po 2670 he 1750 a The absolute neutrophile count of both the younger and older age groups fell during the second week to a value, approximately 70 to 80 per cent of that of the controls (see Fig. 4.1). Following the depression of the total neutrophile count during the second week, the values were unstable until the fifth week. At this time the beginning of a second drop (P< 0.01) was noted for both age groups, and a low value of approximately 50 per cent of controls was reached. The : blate count was maintained at approximately 75 per cent of control values from the seventh week to » the end of the study. Although both age groups followed the same general time pattern of response, the lower age group was below that of the older group throughout most of the observation period. The absolute lymphocyte count of the older age group (Fig. 4.2) had fallen by the third day to a value approximately 55 per cent of the control group. This value was maintained throughout the study, and there was no definite evidence of an upward trend during the study. The values for the younger age group likewise fell before the third day to a value approximately 25 per cent of the control, following which there was a significant upward trend. With the total lymphocyte count, there is a consistent difference between the two age groups. However, during the first four weeks the difference is accentuated when expressed as per cent decrease because of the relatively high lymphocyte levels in the lower age control group. After this period the differences expressed as per cent are less marked since recovery was more rapid in the younger age group. The cellular elements chiefly responsible for the fluctuations in total white blood cell count can be determined by comparing the total white, neutrophile and lymphocyte counts (Fig. 4.3). It is seen that the lymphocyte count remained essentially constant throughout the period 79 Wrenn eee of study, while the total neutrophile count fluctuated with a pattern essentially identical to that