Regarding the mouthwash, I agree that once the virus invades the LRT, it is useless. However many times COViD starts as URTI and it is localized to the nasopharyngeal mucosal epithelia. During this time, gargling could reduce viral load in the mouth thus reducing transmission risk and symptoms. Please check ELVIS trial out of university of Edinburgh. Same team is running similar trial for COVID. While I agree it won’t cure it, it might offer benefits when applied early in the infection cycle.
Regarding the mouthwash, I agree that once the virus invades the LRT, it is useless. However many times COViD starts as URTI and it is localized to the nasopharyngeal mucosal epithelia. During this time, gargling could reduce viral load in the mouth thus reducing transmission risk and symptoms. Please check ELVIS trial out of university of Edinburgh. Same team is running similar trial for COVID. While I agree it won’t cure it, it might offer benefits when applied early in the infection cycle.