Focal hemorrhage and necrosis of the lung tissue may occur with hemorragic infarction. Intra-alveolar fibrosis, resulting from organization of inflammatory exudates also can be found. The epithelium of the bronchial mucosa in lungs discards, and there is formation of mucus and mucus plugs in the cavity. The coronavirus particles can be seen in the bronchial mucosal epithelium and type 2 alveolar epithelial cells under an electrone microscope.