Povidone Iodine Mouthwash, Gargle, and Nasal Spray to Reduce Nasopharyngeal Viral Load in Patients With COVID-19: A Randomized Clinical Trial
Guenezan et al., JAMA Otolaryngol Head Neck Surg., doi:10.1001/jamaoto.2020.5490
https://c19early.org/guenezan.html