Background Aerosolization of respiratory droplets is considered the main route of coronavirus disease 2019 (COVID-19). Therefore, reducing the viral load of Severe Acute Respiratory Syndrome-Coronavirus 2 (SARS-CoV-2) shed via respiratory droplets is potentially an ideal strategy to prevent the spread of the pandemic. The in vitro virucidal activity of intranasal Povidone-Iodine (PVP-I) has been demonstrated recently to reduce SARS-CoV-2 viral titres. This study evaluated the virucidal activity of the aqueous solution of Iodine-V (a clathrate complex formed by elemental iodine and fulvic acid) as in Essential Iodine Drops (EID) with 200 μg elemental iodine/ml content against SARS-CoV-2 to ascertain whether it is a better alternative to PVP-I. Methods SARS-CoV-2 (USAWA1/2020 strain) virus stock was prepared by infecting Vero 76 cells (ATCC CRL-1587) until cytopathic effect (CPE). The virucidal activity of EID against SARS-CoV-2 was tested in three dilutions (1:1; 2:1 and 3:1) in triplicates by incubating at room temperature (22 ± 2°C) for either 60 or 90 seconds. The surviving viruses from each sample were quantified by a standard end-point dilution assay. Results EID (200 μg iodine/ml) after exposure for 60 and 90 seconds was compared to controls. In both cases, the viral titre was reduced by 99% (LRV 2.0). The 1:1 dilution of EID with virus reduced SARS-CoV-2 virus from 31,623 cell culture infectious dose 50% (CCID 50 ) to 316 CCID 50 within 90 seconds. Conclusion Substantial reductions in LRV by Iodine-V in EID confirmed the activity of EID against SARS-CoV-2 in vitro, demonstrating that Iodine-V in EID is effective at inactivating the virus in vitro and therefore suggesting its potential application intranasally to reduce SARS-CoV-2 transmission from known or suspected COVID-19 patients.
【초록키워드】 COVID-19, coronavirus disease, viruses, SARS-CoV-2, Coronavirus disease 2019, pandemic, SARS-CoV-2 virus, aerosolization, in vitro, virus, Spread, Severe acute respiratory syndrome, SARS-CoV-2 transmission, Viral, Viral load, Cell culture, virucidal, Iodine, temperature, povidone-iodine, respiratory, intranasal, COVID-19 patients, CPE, Cytopathic effect, Vero, infectious dose, Dilution, room temperature, Respiratory droplets, aqueous solution, titres, complex, titre, drop, fulvic acid, infecting, respiratory droplet, Prevent, controls, effective, Cell, SARS-CoV-2 viral, ATCC, Result, intranasally, evaluated, reduced, reducing, demonstrated, reductions in, reduce, virus stock, was reduced, quantified, 1:1, CCID, end-point dilution, Essential, was tested, 【제목키워드】 SARS-CoV-2,