Distribution of monoblasts by ploidy during acute ASFV infection. A - ploidy of monoblasts at 3 dpi, B - at 4 dpi, C - at 5 dpi, D - at 6 dpi, E - the nucleus of monoblast stained by the method of Feulgen for ploidy analysis. X axis is the ploidy of cells. Y axis is the percent of distribution of cells. Data are presented from 3 dpi because no changes in ploidy (they were diploid as in control) were seen at 1-3 dpi. A few monoblasts, with hypodiploid DNA content, were detected at 7 dpi, and therefore data for 7 dpi are not presented. Cells were examined at 1250 × magnification. Scale bar is 10 μm.