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The effect of SARS-CoV-2 on the lung tissue in the human post-mortem. A In the control group, the lung parenchyma, including the alveolar sac and alveolar walls, has a normal appearance. B In the COVID-19 group, infiltration of lung tissue by mononuclear inflammatory cells (black arrow), along with desquamation of alveolar epithelium and formation of hyaline membrane together alveolar wall thickening was observed (red arrow)
