COVID-19(31) SARS-CoV-2(29) SARS-COV-2 infection(11) macrophages(11) viral infection(10) caused(9) Autopsy(9) Patient(9) Spike protein(8) endothelial cells(7) Endothelial cell(7) Research(7) In situ hybridization(7) SARS-CoV-2.(7) coronavirus disease(7) Coronavirus disease 2019(7) alveolar macrophage(5) Endothelialitis(5) debate(5) Delta(5) autopsy studies(5) variants(5) high viral load(5) COVID-19 patient(5) infected cell(5) omicron(5) was used(5) Viral load(5) epithelial cells(5) protein-coding RNA(5)