inclusion criteria: 1. age ≥18 and ≤75, male or female. 2. asymptomatic infection, mild, or common type of covid-19. 3. initial positive test of sars-cov-2 within 5 days of randomization. 4. initial onset of covid-19 signs/symptoms within 3 days of randomization. 5. the ct value of sars-cov-2 nucleic acid test before randomization is ≤ 25, or the ct value is \>25 and sars-cov-2 serum igg and igm are negative.

inclusion criteria: 1. age ≥18 and ≤75, male or female. 2. asymptomatic infection, mild, or common type of covid-19. 3. initial positive test of sars-cov-2 within 5 days of randomization. 4. initial onset of covid-19 signs/symptoms within 3 days of randomization. 5. the ct value of sars-cov-2 nucleic acid test before randomization is ≤ 25, or the ct value is \>25 and sars-cov-2 serum igg and igm are negative.

inclusion criteria: age ≥18 and ≤75, male or female. asymptomatic infection, mild, or common type of covid-19. initial positive test of sars-cov-2 within 5 days of randomization. initial onset of covid-19 signs/symptoms within 3 days of randomization. the ct value of sars-cov-2 nucleic acid test before randomization is ≤ 25, or the ct value is >25 and sars-cov-2 serum igg and igm are negative.

inclusion criteria: age ≥18 and ≤75, male or female. asymptomatic infection, mild, or common type of covid-19. initial positive test of sars-cov-2 within 5 days of randomization. initial onset of covid-19 signs/symptoms within 3 days of randomization. the ct value of sars-cov-2 nucleic acid test before randomization is ≤ 25, or the ct value is >25 and sars-cov-2 serum igg and igm are negative.