SUNRISE-3: Efficacy and Safety of Bemnifosbuvir in High-Risk Outpatients With COVID-19

Inclusion Criteria:

* Positive SARS-CoV-2 test conducted ≤ 5 days prior to randomization
* Mild or moderate COVID-19 with symptom onset ≤ 5 days before randomization and at least one COVID-19 related symptom present at time of screening
* Subject must be high risk, defined below:

1. Age ≥70 years OR
2. Age ≥55 years with one of the following: i) obesity (body mass index \[BMI\] ≥30 kg/m2) ii) diabetes mellitus iii) cardiovascular disease or hypertension iv) chronic lung disease requiring routine therapy OR
3. Age 50 to 54 years with two of the following: i) obesity (BMI ≥30 kg/m2) ii) diabetes mellitus iii) cardiovascular disease or hypertension iv) chronic lung disease requiring routine therapy OR
4. Age ≥18 years with one of the following: i) Down syndrome, sickle cell disease, dementia, Parkinson's disease, or care home residents ii) One of the following immunocompromising conditions or immunosuppressive treatments: receiving chemotherapy for cancer, hematologic malignancy, being within 2 years of a hematopoietic stem cell transplant, receipt of a solid organ transplant and on immunosuppressive therapy, human immunodeficiency virus (HIV) infection untreated or with CD4+ T lymphocyte count \<350 cells per cubic millimeter, moderate/severe primary immunodeficiency, taking immunosuppressive medications
* Use of adequate contraception for females of childbearing potential

Exclusion Criteria:

* Severe or critical COVID-19 illness
* Admitted to a hospital within 90 days prior to randomization due to COVID-19
* Use of other investigational drugs within 30 days prior to planned dosing, or plans to enroll in another clinical trial of an investigational agent while participating in the present study
* Initiation or planned initiation of remdesivir for treatment of the current SARS-CoV-2 infection
* Requirement of prohibited medications, including hydroxychloroquine or amiodarone within 3 months prior to screening. Note: Subjects who had already initiated any COVID-19 drug with antiviral effects intended to treat symptomatic SARS-CoV-2 infection (≥ 24 hours prior to randomization) will be excluded. During screening (or within 24 hours prior to or after randomization), locally available COVID-19 drugs with antiviral effects (including but not limited to nirmatrelvir/ritonavir, molnupiravir, favipiravir, monoclonal antibodies) will be permitted.
* Other known active viral or bacterial infection at the time of screening, such as influenza and respiratory syncytial virus (RSV). Note: This exclusion does not apply to subjects with stable chronic viral infections, such as chronic hepatitis C virus (HCV) or HIV providing other eligibility criteria are met.
* Receiving dialysis or have known severe renal impairment
* History of severe hepatic impairment (Child-Pugh Class C)
* Known allergy or hypersensitivity to components of study drug