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Postmortem, and histopathological lesions in spleen samples from chickens in flock no. 18. (a) Severe atrophy of spleen. (b,c) Severe depletion and rarefication of lymphoid follicles (black arrow). (d,e) Severe multifocal to diffuse areas of splenic necrosis (blue star). H and E stain; scale bar 100 μm. (b,d) ×200. (c,e) ×400.
