{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,30]],"date-time":"2026-09-30T23:28:25Z","timestamp":1790810905664,"version":"4.1.0"},"reference-count":54,"publisher":"Wiley","issue":"2","license":[{"start":{"date-parts":[[2024,9,13]],"date-time":"2024-09-13T00:00:00Z","timestamp":1726185600000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by-nc-nd\/4.0\/"}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["The Laryngoscope"],"published-print":{"date-parts":[[2025,2]]},"abstract":"<jats:sec><jats:title>Objective<\/jats:title><jats:p>Nasal irrigation is a common treatment for sinonasal disorders; however, it is unknown if it can reduce SARS\u2010CoV\u20102 nasopharyngeal viral load (NVL). This systematic review investigated the efficacy of nasal irrigation with saline, povidone iodine (PVP\u2010I), and intranasal corticosteroids (INCS) at reducing SARS\u2010CoV\u20102 NVL and transmissibility.<\/jats:p><\/jats:sec><jats:sec><jats:title>Data Sources<\/jats:title><jats:p>Databases including Embase, MEDLINE, Web of Science, and ClinicalTrials.gov.<\/jats:p><\/jats:sec><jats:sec><jats:title>Review Methods<\/jats:title><jats:p>A systematic review was completed with pre\u2010defined search criteria using keywords related to nasal irrigation and COVID\u201019 from 1946 through January 2024. This review followed PRISMA reporting guidelines and was registered on PROSPERO. Only in\u2010vivo studies testing nasal irrigation with either saline, PVP\u2010I, or INCS for reducing NVL were included.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>Nine out of ten studies on saline\u2010based solutions reported positive effects in reducing NVL, with benefits noted in earlier time to negative nasopharyngeal PCR and a greater decline in NVL during early study time points, compared with controls. Isotonic and hypertonic saline mediums were found to be effective with three studies demonstrating enhanced efficacy with additives. Four out of seven studies on PVP\u2010I showed a positive effect on reducing NVL, but results were heterogenous. Four studies demonstrated reduction of transmission with saline or PVP\u2010I. No studies were found on INCS.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusion<\/jats:title><jats:p>Saline nasal irrigation showed the best efficacy in reducing SARS\u2010CoV\u20102 NVL. Additives to saline may have a clinical benefit, but further studies are needed to elucidate their isolated impacts on NVL. Data on PVP\u2010I is inconclusive and further studies are warranted to determine the ideal concentration for irrigation. <jats:italic>Laryngoscope<\/jats:italic>, 135:517\u2013528, 2025<\/jats:p><\/jats:sec>","DOI":"10.1002\/lary.31761","type":"journal-article","created":{"date-parts":[[2024,9,13]],"date-time":"2024-09-13T13:43:45Z","timestamp":1726235025000},"page":"517-528","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["Washing Illness Away: A Systematic Review of the Impact of Nasal Irrigation and Spray on <scp>COVID<\/scp>\u201019"],"prefix":"10.1002","volume":"135","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-4159-8670","authenticated-orcid":false,"given":"Karan","family":"Gandhi","sequence":"first","affiliation":[{"name":"Department of Otolaryngology\u2010Head and Neck Surgery, Schulich School of Medicine and Dentistry Western University  London Ontario Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0001-5580-6920","authenticated-orcid":false,"given":"Freeman","family":"Paczkowski","sequence":"additional","affiliation":[{"name":"Schulich School of Medicine and Dentistry Western University  London Ontario Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5825-2759","authenticated-orcid":false,"given":"Leigh","family":"Sowerby","sequence":"additional","affiliation":[{"name":"Department of Otolaryngology\u2010Head and Neck Surgery, Schulich School of Medicine and Dentistry Western University  London Ontario Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2024,9,13]]},"reference":[{"key":"e_1_2_11_2_1","unstructured":"Coronavirus (COVID\u201019) | IPAC Canada. 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