Abstract
<h3>Abstract</h3> The need for therapeutic regimens for the non-critically ill patients of the COVID-19 pandemic remains unmet. In this line, repurposing existing drugs, against known or predicted SARS-CoV-2 protein actions, has been advanced, while natural products have also been tested. Previous work has shown that a Cretan Aromatic Plant (<i>Thymbra capitata</i> (L.) Cav., <i>Salvia fruticosa</i> Mill. and <i>Origanum dictamnus</i> L.) essential oil mixture (CAPeo) has a remarkable <i>in vitro</i> antiviral activity against Influenza A & B and Rhinovirus 14 strains, decreasing the symptoms of upper respiratory tract infections, while proven safe in experimental animals and humans. Here, we tested CAPeo in VERO cells infected with SASR-CoV-2. We report that this mixture, at similar concentrations as those previously reported, exhibits a remarkable antiviral activity. Administration of 1 ml of a 1.5% CAPeo in olive oil, in a Proof-of-Concept intervention study in SARS-CoV-2-positive, exhibiting mild COVID-19 symptoms, humans resulted in a significant amelioration of general and local symptoms of the disease. We conclude that CAPeo may be a valuable addition for the prevention and/or treatment of mild COVID-19 ambulatory patients, pending a confirmation through a prospective randomized controlled trial in humans (NCT04705753).
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