Clinical manifestations and histological examinations of tumors from chickens infected with rSD1009 and rSD1009△19.

<p>(A) The liver of an SPF layer infected with rSD1009. (B) The liver of an SPF layer infected with rSD1009△19. The red arrows point to clinical lesions. (C) Histological examination of (A) liver; a large, well-demarcated, non-encapsulated nodule consisting of numerous erythroblasts (as shown on the right side). (D) Histological examination of (B) liver; a large, well-demarcated, non-encapsulated nodule consisting of numerous erythroblasts. All histological examinations used hematoxylin and eosin stain. Scale bar = 50 µm.