1. Able to provide informed consent and have signed Informed Consent Form (ICF) prior to screening procedures, <br/ >2. Men and non-pregnant women 18 years of age or older, <br/ >3. Per investigator judgment, healthy or stable with pre-existing medical conditions that do not require significant change in medication or have led to a hospitalization in the 3 months prior to enrollment or who, in the judgment of the investigator, are unlikely to require a significant change in therapy or hospitalization for worsening disease through Day 56, <br/ >4. Able and willing to comply with all study procedures, <br/ >5. Working or residing in an environment with high risk of exposure to SARS-CoV-2 for whom exposure may be relatively prolonged or for whom personal protective equipment (PPE) may be inconsistently used, especially in confined settings. Examples include: 1. Retail/service workers/educators (restaurant waitresses/waiters and bar workers, street vendors, store cashiers, hairdressers and barbers, veterinary staff, daycare workers, airport screening staff, school teachers and college professors teaching in-person classes, college students attending in-person classes, office workers and volunteers who have multiple brief exposures to people regularly) 2. Factory workers (when working in confined settings with large numbers of employees, meat-packing facilities) 3. Drivers providing bus, taxi or shared ride services (e.g., Uber, Lyft) and delivery services 4. User of public transportation (e.g., bus, train, subway) or public facilities (e.g. gyms) at least 3 times weekly 5. Nursing home staff or correctional facility staff 6. Retirement community residents or adult day program attendees who are regularly eating, socializing and/or exercising in common areas 7. Person 51 years or older living in a multigenerational (at least 3 generations) household 8. First responders (emergency medical technicians, police who are regularly assigned on patrol) Note: Firefighters typically use face shields and other protective gear but may be considered if they regularly assist with medical emergencies in the field 9. Health care workers with prolonged patient interaction (includes nurses and nursing assistants, medical assistants and technicians, respiratory therapists, physical therapists, social workers, dentists and dental hygienists) 10. Others, if in the opinion of the PI, the risk of COVID-19 exposure is comparable to the examples above. <br/ >6. Must meet one of the following criteria with respect to reproductive capacity: 1. Women who are post-menopausal as defined by reported spontaneous amenorrhea for â?¥ 12 month, 2. Surgically sterile or has a partner who is sterile (i.e., vasectomy in males or tubal ligation, absence of ovaries and/or uterus in females). In the case of vasectomy, subjects should wait six (6) months post-vasectomy prior to enrolling, 3. Use of medically effective contraception with a failure rate of < 1% per year when used consistently and correctly from screening until last dose. Acceptable methods include: i. hormonal contraception including implants, injections or oral, ii. two barrier methods, e.g., condom and cervical cap (with spermicide) or diaphragm (with spermicide), iii. intrauterine device or intrauterine system, iv. Abstinence when this is the subjectâ??s preferred and usual lifestyle. Note: Periodic abstinence (e.g., calendar, ovulation, symptothermal, or post-ovulation methods) and withdrawal are not acceptabl

1. Able to provide informed consent and have signed Informed Consent Form (ICF) prior to screening procedures, <br/ >2. Men and non-pregnant women 18 years of age or older, <br/ >3. Per investigator judgment, healthy or stable with pre-existing medical conditions that do not require significant change in medication or have led to a hospitalization in the 3 months prior to enrollment or who, in the judgment of the investigator, are unlikely to require a significant change in therapy or hospitalization for worsening disease through Day 56, <br/ >4. Able and willing to comply with all study procedures, <br/ >5. Working or residing in an environment with high risk of exposure to SARS-CoV-2 for whom exposure may be relatively prolonged or for whom personal protective equipment (PPE) may be inconsistently used, especially in confined settings. Examples include: 1. Retail/service workers/educators (restaurant waitresses/waiters and bar workers, street vendors, store cashiers, hairdressers and barbers, veterinary staff, daycare workers, airport screening staff, school teachers and college professors teaching in-person classes, college students attending in-person classes, office workers and volunteers who have multiple brief exposures to people regularly) 2. Factory workers (when working in confined settings with large numbers of employees, meat-packing facilities) 3. Drivers providing bus, taxi or shared ride services (e.g., Uber, Lyft) and delivery services 4. User of public transportation (e.g., bus, train, subway) or public facilities (e.g. gyms) at least 3 times weekly 5. Nursing home staff or correctional facility staff 6. Retirement community residents or adult day program attendees who are regularly eating, socializing and/or exercising in common areas 7. Person 51 years or older living in a multigenerational (at least 3 generations) household 8. First responders (emergency medical technicians, police who are regularly assigned on patrol) Note: Firefighters typically use face shields and other protective gear but may be considered if they regularly assist with medical emergencies in the field 9. Health care workers with prolonged patient interaction (includes nurses and nursing assistants, medical assistants and technicians, respiratory therapists, physical therapists, social workers, dentists and dental hygienists) 10. Others, if in the opinion of the PI, the risk of COVID-19 exposure is comparable to the examples above. <br/ >6. Must meet one of the following criteria with respect to reproductive capacity: 1. Women who are post-menopausal as defined by reported spontaneous amenorrhea for â?¥ 12 month, 2. Surgically sterile or has a partner who is sterile (i.e., vasectomy in males or tubal ligation, absence of ovaries and/or uterus in females). In the case of vasectomy, subjects should wait six (6) months post-vasectomy prior to enrolling, 3. Use of medically effective contraception with a failure rate of < 1% per year when used consistently and correctly from screening until last dose. Acceptable methods include: i. hormonal contraception including implants, injections or oral, ii. two barrier methods, e.g., condom and cervical cap (with spermicide) or diaphragm (with spermicide), iii. intrauterine device or intrauterine system, iv. Abstinence when this is the subjectâ??s preferred and usual lifestyle. Note: Periodic abstinence (e.g., calendar, ovulation, symptothermal, or post-ovulation methods) and withdrawal are not acceptabl