Figure 1.

Histopathological features of bovine lungs with different types of pneumonia. (a) Normal lung in low magnification (LM) and (b) in high magnification (HM). (c) FBP with multifocal areas of necrosis, congestion and oedema and (d) infiltration of large numbers of oat cells (thin arrow) and fibrin (thick arrow) in alveoli. (e) IP with thickening of alveolar septa and infiltration of inflammatory cells and (f) type II pneumocytes hyperplasia (arrows). (g) and (h) SBP with predominate infiltration by large numbers of neutrophils (thick arrow). (i) and (j) bronchiolitis with necrotic epithelial cells, loss of cilia and inflammatory cells infiltrated mucosa and submucosa. (k) and (l) showed multifocal areas of coagulative necrosis characterized by hypereosinophilic materials and necrotic cellular debris (thin arrows and stars). Haematoxylin and eosin stain. (a), (c), (e), (g), (k): low magnification, 500 μm; (i): low magnification, 100 μm; (b), (d), (f), (j), (l): high magnification, 50 μm