Radiation exposure significantly reduces blood cell counts. Pigs were exposed to 2.5 Gy from x-rays. Complete blood cell counts with differential were determined in peripheral blood collected pre-irradiation and at several time points post-irradiation (1.5 – 30 days). Statistically significant differences between treatments were determined with a paired Student's t-test; they are indicated in the figure by # (p < 0.1), * (p < 0.05), ** (p < 0.05), or *** (p < 0.001). Blood cell counts are reported for (a) WBCs, (b) lymphocytes, (c) neutrophils, and (d) monocytes; the blood cells counts are represented as the average absolute count ± SD (n=3, except for days 16-30, at which points n < 3 and there were no statistical analyses performed).