subjects will not be eligible if they meet any of the following criteria: - any subject who is a current smoker or has a ≥ 10 pack year smoking history. - subjects with a medical history of chronic obstructive pulmonary disease (copd). - subjects who are in hospice or receiving comfort care only. - subjects who have symptomatic laboratory-confirmed covid-19 at the time of screening or randomization. - subjects with current evidence of an unstable medical disorder including an unstable respiratory disorder, gastrointestinal disorder (including child-pugh class b and c hepatic impairment), renal disorder (including subjects with an estimated glomerular filtration rate (egfr) ≤30 ml/min/1.73m2), or hematologic disorder (including active leukemia). - subjects receiving immunosuppressive therapy including chronic use of prednisone >10 mg daily (however, inhaled corticosteroids and acute use of higher doses of prednisone to treat conditions such as exacerbation of asthma or other acute conditions are allowed). - subjects with an immunodeficiency disease, including a positive human immunodeficiency virus (hiv) test result. - sexually active males with a partner of child-bearing potential

subjects will not be eligible if they meet any of the following criteria: - any subject who is a current smoker or has a ≥ 10 pack year smoking history. - subjects with a medical history of chronic obstructive pulmonary disease (copd). - subjects who are in hospice or receiving comfort care only. - subjects who have symptomatic laboratory-confirmed covid-19 at the time of screening or randomization. - subjects with current evidence of an unstable medical disorder including an unstable respiratory disorder, gastrointestinal disorder (including child-pugh class b and c hepatic impairment), renal disorder (including subjects with an estimated glomerular filtration rate (egfr) ≤30 ml/min/1.73m2), or hematologic disorder (including active leukemia). - subjects receiving immunosuppressive therapy including chronic use of prednisone >10 mg daily (however, inhaled corticosteroids and acute use of higher doses of prednisone to treat conditions such as exacerbation of asthma or other acute conditions are allowed). - subjects with an immunodeficiency disease, including a positive human immunodeficiency virus (hiv) test result. - sexually active males with a partner of child-bearing potential