* diagnosed or suspected cognitive impairment that would prevent the patient from cooperating with study procedures, as judged by the screening clinician * asymptomatic patients (e.g. patients who were screened without symptoms but tested positive) * known or suspected liver disease or hepatitis c * known kidney disease with estimate glomerular filtration rate (egfr) \<60 * patients on warfarin, novel oral anticoagulants (noacs), hiv protease inhibitors, immunosuppressants, hydroxychloroquine/chloroquine, and other medication with a narrow therapeutic window. * allergy to grapes or rice. * co-morbidities with a high likelihood of hospitalization within 30 days (e.g., current cancer treatment, severe chronic obstructive pulmonary disease (copd) or congestive heart failure (chf)) * currently pregnant * hospitalization

* diagnosed or suspected cognitive impairment that would prevent the patient from cooperating with study procedures, as judged by the screening clinician * asymptomatic patients (e.g. patients who were screened without symptoms but tested positive) * known or suspected liver disease or hepatitis c * known kidney disease with estimate glomerular filtration rate (egfr) \<60 * patients on warfarin, novel oral anticoagulants (noacs), hiv protease inhibitors, immunosuppressants, hydroxychloroquine/chloroquine, and other medication with a narrow therapeutic window. * allergy to grapes or rice. * co-morbidities with a high likelihood of hospitalization within 30 days (e.g., current cancer treatment, severe chronic obstructive pulmonary disease (copd) or congestive heart failure (chf)) * currently pregnant * hospitalization

- diagnosed or suspected cognitive impairment that would prevent the patient from cooperating with study procedures, as judged by the screening clinician - asymptomatic patients (e.g. patients who were screened without symptoms but tested positive) - known or suspected liver disease or hepatitis c - known kidney disease with estimate glomerular filtration rate (egfr) <60 - patients on warfarin, novel oral anticoagulants (noacs), hiv protease inhibitors, immunosuppressants, hydroxychloroquine/chloroquine, and other medication with a narrow therapeutic window. - allergy to grapes or rice. - co-morbidities with a high likelihood of hospitalization within 30 days (e.g., current cancer treatment, severe chronic obstructive pulmonary disease (copd) or congestive heart failure (chf)) - currently pregnant - hospitalization

- diagnosed or suspected cognitive impairment that would prevent the patient from cooperating with study procedures, as judged by the screening clinician - asymptomatic patients (e.g. patients who were screened without symptoms but tested positive) - known or suspected liver disease or hepatitis c - known kidney disease with estimate glomerular filtration rate (egfr) <60 - patients on warfarin, novel oral anticoagulants (noacs), hiv protease inhibitors, immunosuppressants, hydroxychloroquine/chloroquine, and other medication with a narrow therapeutic window. - allergy to grapes or rice. - co-morbidities with a high likelihood of hospitalization within 30 days (e.g., current cancer treatment, severe chronic obstructive pulmonary disease (copd) or congestive heart failure (chf)) - currently pregnant - hospitalization

- diagnosed or suspected cognitive impairment that would prevent the patient from cooperating with study procedures, as judged by the screening clinician - asymptomatic patients (e.g. patients who were screened without symptoms but tested positive) - known or suspected liver disease or hepatitis c - known kidney disease with egfr <60 - patients on warfarin, novel oral anticoagulants (noacs), hiv protease inhibitors, immunosuppressants, hydroxychloroquine/chloroquine, and other medication with a narrow therapeutic window. - allergy to grapes or rice. - co-morbidities with a high likelihood of hospitalization within 30 days (e.g., current cancer treatment, severe copd or chf) - currently pregnant - hospitalization

- diagnosed or suspected cognitive impairment that would prevent the patient from cooperating with study procedures, as judged by the screening clinician - asymptomatic patients (e.g. patients who were screened without symptoms but tested positive) - known or suspected liver disease or hepatitis c - known kidney disease with egfr <60 - patients on warfarin, novel oral anticoagulants (noacs), hiv protease inhibitors, immunosuppressants, hydroxychloroquine/chloroquine, and other medication with a narrow therapeutic window. - allergy to grapes or rice. - co-morbidities with a high likelihood of hospitalization within 30 days (e.g., current cancer treatment, severe copd or chf) - currently pregnant - hospitalization