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| 5) Petechial hemorrhages seen in the thigh muscles. | 6) Hemorrhages on mucosa of the proventiculus. |
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| 7) Necrosis of lymphatic follicles and edema of interstitial tissues of the bursa Fabricius (HE staining). | 8) Disappearance of lymphocytes from lymphatic follicles and detension of hyaline substances in the medulla of the bursa Fabricius (HE staining). |
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