* patient participation in a covid-19 research study using experimental drugs, * use of an antiseptic mouthwash for 48 h before the start of the study * any known hypersensitivity or allergy to components of the mouthwashes.

* patient participation in a covid-19 research study using experimental drugs, * use of an antiseptic mouthwash for 48 h before the start of the study * any known hypersensitivity or allergy to components of the mouthwashes.

patient participation in a covid-19 research study using experimental drugs, use of an antiseptic mouthwash for 48 h before the start of the study any known hypersensitivity or allergy to components of the mouthwashes.

patient participation in a covid-19 research study using experimental drugs, use of an antiseptic mouthwash for 48 h before the start of the study any known hypersensitivity or allergy to components of the mouthwashes.