Peripheral white blood cells of uninfected pigs. A - eosinophil, B - basophil, C - medium lymphocyte, D - small and large lymphocytes, E - monocyte, F - segmented neutrophil, G, H - band neutrophils. Blood slides were stained by Giemsa modified solution. Cells were examined under the light microscope at 1250 × magnification. Scale bar is 10 μm.