- sinonasal tumor - hypersensitivity to iodine or betadine - history of thyroid disorder including thyroid cancer, hyperthyroidism and hypothyroidism - use of medications for thyroid disorders including thyroxine and carbimazole - current use of topical iodine or betadine for another reason - participating in any study with therapies directed at covid-19 that could influence our results - are pregnant or breastfeeding

- sinonasal tumor - hypersensitivity to iodine or betadine - history of thyroid disorder including thyroid cancer, hyperthyroidism and hypothyroidism - use of medications for thyroid disorders including thyroxine and carbimazole - current use of topical iodine or betadine for another reason - participating in any study with therapies directed at covid-19 that could influence our results - are pregnant or breastfeeding