positive sars-cov-2 test group (target enrollment: n=1,800) nutrovid treat trial: adult men/women recently diagnosed with covid-19 (positive pcr test for sars-cov-2 coronavirus) within \<=5 days of symptom onset; and satisfying one of these risk factors: \>=50 years old; or diabetic \& \>=40 years old; or obese \& \>=40 years old. negative sars-cov-2 test group (target enrollment: n=1,800) nutrovid prevent trial: adult men/women recently tested negative for covid-19 (negative pcr test for sars-cov-2 coronavirus); and satisfying one of these risk factors: \>=50 years old; or diabetic \& \>=40 years old; or obese \& \>=40 years old. signed informed consent form

positive sars-cov-2 test group (target enrollment: n=1,800) nutrovid treat trial: adult men/women recently diagnosed with covid-19 (positive pcr test for sars-cov-2 coronavirus) within \<=5 days of symptom onset; and satisfying one of these risk factors: \>=50 years old; or diabetic \& \>=40 years old; or obese \& \>=40 years old. negative sars-cov-2 test group (target enrollment: n=1,800) nutrovid prevent trial: adult men/women recently tested negative for covid-19 (negative pcr test for sars-cov-2 coronavirus); and satisfying one of these risk factors: \>=50 years old; or diabetic \& \>=40 years old; or obese \& \>=40 years old. signed informed consent form

positive sars-cov-2 test group (target enrollment: n=1,800) nutrovid treat trial: adult men/women recently diagnosed with covid-19 (positive pcr test for sars-cov-2 coronavirus) within <=5 days of symptom onset; and satisfying one of these risk factors: >=50 years old; or diabetic & >=40 years old; or obese & >=40 years old. negative sars-cov-2 test group (target enrollment: n=1,800) nutrovid prevent trial: adult men/women recently tested negative for covid-19 (negative pcr test for sars-cov-2 coronavirus); and satisfying one of these risk factors: >=50 years old; or diabetic & >=40 years old; or obese & >=40 years old. signed informed consent form

positive sars-cov-2 test group (target enrollment: n=1,800) nutrovid treat trial: adult men/women recently diagnosed with covid-19 (positive pcr test for sars-cov-2 coronavirus) within <=5 days of symptom onset; and satisfying one of these risk factors: >=50 years old; or diabetic & >=40 years old; or obese & >=40 years old. negative sars-cov-2 test group (target enrollment: n=1,800) nutrovid prevent trial: adult men/women recently tested negative for covid-19 (negative pcr test for sars-cov-2 coronavirus); and satisfying one of these risk factors: >=50 years old; or diabetic & >=40 years old; or obese & >=40 years old. signed informed consent form

inclusion criteria: - positive sars-cov-2 test group (target enrollment: n=1,800) treatment trial: adult men/women recently diagnosed with covid-19 (positive pcr test for sars-cov-2 coronavirus) within <=5 days of symptom onset; and satisfying one of these risk factors: >=50 years old; or diabetic & >=40 years old; or obese & >=40 years old. - negative sars-cov-2 test group (target enrollment: n=1,800) prevention trial: adult men/women recently tested negative for covid-19 (negative pcr test for sars-cov-2 coronavirus); and satisfying one of these risk factors: >=50 years old; or diabetic & >=40 years old; or obese & >=40 years old. signed informed consent form

inclusion criteria: - positive sars-cov-2 test group (target enrollment: n=1,800) treatment trial: adult men/women recently diagnosed with covid-19 (positive pcr test for sars-cov-2 coronavirus) within <=5 days of symptom onset; and satisfying one of these risk factors: >=50 years old; or diabetic & >=40 years old; or obese & >=40 years old. - negative sars-cov-2 test group (target enrollment: n=1,800) prevention trial: adult men/women recently tested negative for covid-19 (negative pcr test for sars-cov-2 coronavirus); and satisfying one of these risk factors: >=50 years old; or diabetic & >=40 years old; or obese & >=40 years old. signed informed consent form