COVID-19(22) SARS-CoV-2(16) Infection(6) viral replication(6) airway(6) Viral(6) Oxygenation(6) Treatment(6) Defense(4) cells(4) raise(4) Lung function(4) subjects(4) Placebo(4) Plaque assay(4) no effect(4) clinical trial(4) healthy subjects(4) USA-WA1/2020(4) Replication(4) Prevent(4) was determined(4) N protein(4) human airway epithelial(4) in vivo(4) phase(4) Airway inflammation(4) SARS-COV-2 infection(4) mechanical ventilation(4) osmolality(4)