all of the following criteria must be fulfilled for inclusion: * patients must have willingness to read and sign a copy of informed consent form. * males and females, ≥ 18 years old. * covid-19 positive patients confirmed via any diagnostic test and/or presented with covid-19 clinical symptoms at point of consent. exclusion criteria for patients patients presenting with any of the following will not be included in the trial: * known pre-existing chronic mucosal lesions e.g. lichen planus or other oropharyngeal lesions, reported by patient or recorded in the existing patient' medical notes; * patients currently intubated or not capable of mouth rinse or spit; * history of head and neck radiotherapy or chemotherapy; * self-reported xerostomia; * known allergy or hypersensitivity to chlorhexidine digluconate or one of the mouthwashes constituents; * other severe acute or chronic medical or psychiatric condition or laboratory abnormality that may increase the risk associated with trial participation or may interfere with the interpretation of trial results and, in the judgement of the investigator, would make the subject inappropriate for entry into this trial; * inability to comply with study protocol.

all of the following criteria must be fulfilled for inclusion: * patients must have willingness to read and sign a copy of informed consent form. * males and females, ≥ 18 years old. * covid-19 positive patients confirmed via any diagnostic test and/or presented with covid-19 clinical symptoms at point of consent. exclusion criteria for patients patients presenting with any of the following will not be included in the trial: * known pre-existing chronic mucosal lesions e.g. lichen planus or other oropharyngeal lesions, reported by patient or recorded in the existing patient' medical notes; * patients currently intubated or not capable of mouth rinse or spit; * history of head and neck radiotherapy or chemotherapy; * self-reported xerostomia; * known allergy or hypersensitivity to chlorhexidine digluconate or one of the mouthwashes constituents; * other severe acute or chronic medical or psychiatric condition or laboratory abnormality that may increase the risk associated with trial participation or may interfere with the interpretation of trial results and, in the judgement of the investigator, would make the subject inappropriate for entry into this trial; * inability to comply with study protocol.

all of the following criteria must be fulfilled for inclusion: - patients must have willingness to read and sign a copy of informed consent form. - males and females, ≥ 18 years old. - covid-19 positive patients confirmed via any diagnostic test and/or presented with covid-19 clinical symptoms at point of consent. exclusion criteria for patients patients presenting with any of the following will not be included in the trial: - known pre-existing chronic mucosal lesions e.g. lichen planus or other oropharyngeal lesions, reported by patient or recorded in the existing patient' medical notes; - patients currently intubated or not capable of mouth rinse or spit; - history of head and neck radiotherapy or chemotherapy; - self-reported xerostomia; - known allergy or hypersensitivity to chlorhexidine digluconate or one of the mouthwashes constituents; - other severe acute or chronic medical or psychiatric condition or laboratory abnormality that may increase the risk associated with trial participation or may interfere with the interpretation of trial results and, in the judgement of the investigator, would make the subject inappropriate for entry into this trial; - inability to comply with study protocol.

all of the following criteria must be fulfilled for inclusion: - patients must have willingness to read and sign a copy of informed consent form. - males and females, ≥ 18 years old. - covid-19 positive patients confirmed via any diagnostic test and/or presented with covid-19 clinical symptoms at point of consent. exclusion criteria for patients patients presenting with any of the following will not be included in the trial: - known pre-existing chronic mucosal lesions e.g. lichen planus or other oropharyngeal lesions, reported by patient or recorded in the existing patient' medical notes; - patients currently intubated or not capable of mouth rinse or spit; - history of head and neck radiotherapy or chemotherapy; - self-reported xerostomia; - known allergy or hypersensitivity to chlorhexidine digluconate or one of the mouthwashes constituents; - other severe acute or chronic medical or psychiatric condition or laboratory abnormality that may increase the risk associated with trial participation or may interfere with the interpretation of trial results and, in the judgement of the investigator, would make the subject inappropriate for entry into this trial; - inability to comply with study protocol.