- the subject is related to any study personnel or has any other close ties or conflicts of interest with the study sponsor. - the subject has received any investigational drug or participated in a clinical trial within 4 weeks of entry to this study - known hypersensitivity or allergy to any component of the test product - severe cardiovascular, endocrinological, neurological, respiratory, gastrointestinal disease or a history or any current disease that is considered by the investigator as a reason for exclusion. - the subject has a clinically significant disease that could interfere with participation in the study, with the intervention being studied, or with the evaluation of symptoms. specific exclusions include immune deficiency, autoimmune disease, substantive cardiovascular, endocrinological, neurological, respiratory, or gastrointestinal disease. - asymptomatic disease such as elevated blood pressure or cholesterol will not be a reason for exclusion. those with well-controlled mental illness (e.g. depression, anxiety) will be eligible. the enrolling physician will be empowered to exclude potential subjects that s/he deems unreliable. - pregnant women at the time of recruitment will be excluded from the study - current medication other than oral contraception, that is considered by the investigator as a reason for exclusion e.g. intranasal medication - participation in another antiviral clinical trial

- the subject is related to any study personnel or has any other close ties or conflicts of interest with the study sponsor. - the subject has received any investigational drug or participated in a clinical trial within 4 weeks of entry to this study - known hypersensitivity or allergy to any component of the test product - severe cardiovascular, endocrinological, neurological, respiratory, gastrointestinal disease or a history or any current disease that is considered by the investigator as a reason for exclusion. - the subject has a clinically significant disease that could interfere with participation in the study, with the intervention being studied, or with the evaluation of symptoms. specific exclusions include immune deficiency, autoimmune disease, substantive cardiovascular, endocrinological, neurological, respiratory, or gastrointestinal disease. - asymptomatic disease such as elevated blood pressure or cholesterol will not be a reason for exclusion. those with well-controlled mental illness (e.g. depression, anxiety) will be eligible. the enrolling physician will be empowered to exclude potential subjects that s/he deems unreliable. - pregnant women at the time of recruitment will be excluded from the study - current medication other than oral contraception, that is considered by the investigator as a reason for exclusion e.g. intranasal medication - participation in another antiviral clinical trial