Researchers concluded that using a nasal spray that deactivates the SARS-CoV-2 virus in the nose, "may not only prevent person-to-person spread of SARS-CoV-2, but may also diminish the severity of disease in patients by limiting spread and decreasing viral load delivered to the lungs."

Frank, S., et al., (2020). In Vitro Efficacy of a Povidone-lodine Nasal Antiseptic for Rapid Inactivation of SARS-COV-2. JAMA Otolaryngology- Head & Neck Surgery.