Fig. 2.

Visna-maedi virus-infected sheep. a Grossly, the lungs of all examined sheep were pale gray to pink and non-collapsed, with rib impressions and a diffusely rubbery texture. Inset. On the cut surface, multifocal white areas were present throughout the pulmonary parenchyma, mainly surrounding bronchi (arrow). b Histologic findings. The lungs had interstitial pneumonia with distinct large lymphoid follicle-like structures (arrow) around bronchi, bronchioles, and vessels. H&E, 600 μm