Fig. 1

Histopathological observations of the tissue samples from red panda cubs in the Chengdu Research Base of Giant Breeding, Sichuan Province, P.R. China, 2014–2020. Hematoxylin and eosin (HE). A Typical acute interstitial pneumonia with thickened alveolar septa and mononuclear cell infiltration, 200 × . B Lobar bronchopneumonia, the alveolar wall is congested and thickened, and the bronchial lumen is filled with numerous neutrophils, red blood cells and a variable number of exfoliated epithelial cells, 200 × . C Acute fibrinous pneumonia with large amounts of plasma and exfoliated epithelial cells in the alveolar cavity, 100 × . D Hepatocellular hydropic degeneration and steatosis, 400 × . E Gastric mucosal epithelial necrosis with lymphoplasmacytic inflammation, 100 × . F Duodenum mucosal necrosis with hemorrhage and inflammation, 100 × . G Widened intermyocardial edema, leaky hemorrhage and granular degeneration, 100 × . H Myocardial necrosis and calcification, 100 × . I Intermuscular congestion and extensive fatty degeneration of cardiomyocytes, 200 × . J Pulmonary vein neutrophilic thrombosis, 400 × . K Renal cortical glomerular and tubular loss, with replacement interstitial fibrosis, 200 × . L Renal cortical tubular necrosis, interstitial fibrosis and edema, 100 ×