‘A daily nasal spray with saline can prevent nasal symptoms of common cold in a population of otherwise healthy adults.’
https://pubmed.ncbi.nlm.nih.gov/15513550/
https://pubmed.ncbi.nlm.nih.gov/15513550/
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https://www.thelancet.com/journals/lanres/article/PIIS2213-2600(24)00140-1/fulltext