In monkeys subjected to a single dose of LD/50 total body x-irradiation, the periods of initial fall, continued depression and subsequent recovery were determined for total white counts, neutrophils, eosinophils, lymphocytes, monocytes, erythrocytes and platelets.

In general, the effect of irradiation upon the blood picture in the monkey parallels closely that observed in lower animals. Discrepancies in the leukocyte recovery times between human atomic bomb casualties and animals, including the monkey, are noted.

Observations on eosinophils and lymphocytes which bear upon the role of irradiation as a stress stimulus are presented and discussed.

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© 1953 by American Society of Hematology, Inc.
1953
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