Iodine to lessen chances of spreading/contracting COVID-19

'The Use of Povidone Iodine Nasal Spray and Mouthwash During the Current COVID-19 Pandemic May Reduce Cross Infection and Protect Healthcare Workers':
https://papers.ssrn.com/sol3/papers.cfm?abstract_id=3563092

Note that solutions of the kind of iodine mentioned in the article maybcontain harmful substances (when injested) in the USA.

iodine_