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mately 50% of that of the controls was reached. The
level was maintained at approximately 75% of the control values from the 7th week to the end of the critical
period of observation (10th week). The values for the
lower age group were below those of the older age group
throughout most of the period of observation. The absolute lymphocyte count (fig. 1) of the older age group had
fallen by the third day to a value of approximately 55%
of the control value. This value was maintained through-
out the study, with no definite evidence of an upward
trend: The values for the younger age group also fell
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183
Fig. 1.—Mean leukocyte changes in highest exposure group (54 people).
before the third day to a value of approximately 25%
of the control value, after which there was a significant
upward trend, recovery being more rapid in the younger
age group. Since the mean lymphocyte counts remained
essentially constant throughoutthe study, the fluctuation
in total white blood cell count was a reflection of changes
in the neutrophil component (fig. 1).
The sequelae of depression of hemopoiesisare generally considered. as: the: major source of morbidity and
9012592