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. 2021 Jul 31;114(1):301–310. doi: 10.1016/j.athoracsur.2021.06.076

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© 2022 by The Society of Thoracic Surgeons.

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Representative histologic images (hematoxylin and eosin stain; original magnification ×20) of the airways. (A) COVID-19 survivor (patient 11) with basement membrane fibrosis (arrow) and scant submucosal inflammation. (B) Negative control (patient 5) shows similar basement membrane fibrosis (arrow). (C) COVID-19 end-stage lung disease (patient 19) exhibits postmortem sloughing and scant lymphocytic inflammation in the submucosa. (D) COVID-19 end-stage lung disease (patient 17) with basement membrane fibrosis (arrow) and moderate submucosal and intraepithelial inflammation. Scale bars (bottom left corner): ∼250 μm.