COVID-19(1) baseline(1) Endpoint(1) COVID-19 illness(1) therapy(1) clearance(1) progression(1) polymerase chain(1) Randomized(1) evaluated(1) Placebo(1) comparable(1) assessment(1) accelerated(1) double-blind(1) vaccination(1) the placebo group(1) parallel group(1) pharmaceutical(1) Comorbidities(1) secondary(1) Nasal spray(1) defined(1) Mild(1) median(1) SARS-CoV-2 RNA(1) mutate(1) Viral load.(1) Treatment(1) infected with SARS-CoV-2(1)