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. 2019 Jan 18;98(5):1976–1984. doi: 10.3382/ps/pey551

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© The Author(s) 2019. Published by Oxford University Press on behalf of Poultry Science Association.

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0/), which permits non-commercial re-use, distribution, and reproduction in any medium, provided the original work is properly cited. For commercial re-use, please contact journals.permissions@oup.com

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Figure 1. — Histopathological lesions in the bursa of Fabricius in chickens infected with very virulent IBDV (H.E.). a: gland like structures both in the follicules and lamina epithelialis (arrow) and lympho-mononuclear cell infiltration in the interfollicular areas (star) and follicular atrophy (arrow head), bar: 100 μm; b: Edema and enlargement in the interfollicular areas (star) and follicular atrophy (arrow), bar: 100 μm; c: Lympho-mononuclear cell infiltration in the interfollicular areas (arrow head) and hemorrhages (star) bar: 50 μm; d: In some follicules, vacuolizations and necrosis in medullary areas and in some of them infiltration of endothelial macrophages (arrow) and excess formation of fibrous connectivetissue (star) and follicular atrophy, bar: 50μm.