Fig. 2

Histological characterization of lung tissue. a Gross examination of the lungs shows massive thrombosis of medium-sized arteries (arrows). b Lung tissue section display a large vessel partially obstructed by a thrombus (arrow). c Lung parenchyma showing extravasated eritrocytes in interalveolar septa (arrows). d Edema and inflammatory infiltrate are visible in multiple foci in the lung tissue. e Lung areas not affected by histopathological changes. f Numerous CD8+ T lymphocytes are present into alveolar septa and around vessels (arrows). Scale bars: b = 100 μm; c = 7 μm; d-f = 50 μm