Fig. 2

a, b Transbronchial lung biopsy sample from right lower lung (right B⁸); sample stained with hematoxylin and eosin (HE) and viewed at high power. c Airway mucosal biopsy sample from secondary carina; sample stained with HE and viewed at high power. Bar indicates 200 μm. a shows small blood vessel with neutrophil and eosinophil infiltration. Alveolar septa are thickened. b Shows lots of red blood cells on the lung tissue and intra-alveolar bleeding with septal edema. c Shows smooth muscle hyperplasia and thickened basement membrane with eosinophil infiltration