PROS1 and COVID-19: Although SARS-CoV2-induced immunopathology can affect several organs, postmortem examination shows that for most COVID-19 patients, the primary cause of death was acute lung injury associated with the presence of virions and spike (S) proteins in lung blood vessels, endothelial injury, increases in leukocyte infiltration in lung tissues, circulating prothrombotic factors, inflammation, and thrombosis [4,5,6,7].