Inclusion Criteria:1.Patient capable of giving consent, or, when the patient is not capable of giving consent, by his or her legal/authorized representatives prior to initiation of any study procedures.  2.Male or female, between 18 and 65 years of age at the time of consent. 3.Laboratory-confirmed SARS-CoV-2 infection as determined by RT-PCR in nasopharyngeal or oropharyngeal swabs < 72 hours prior to enrollment.  4Patients with asymptomatics or mild COVID-19, including:  Patients with asymptomatic infections refer to those with positive testing results in etiological detection of SARS-CoV-2 in swabs, but without any relevant clinical manifestations, such as self-perceived or clinically identified symptoms or signs, including fever, cough and sore throat, and without any typical imaging features of COVID-19 in their CT scans.  Patients with mild SARS-COV-2 infections refer to those who are infected with SARS-COV-2 presenting mild symptoms in accordance with Diagnosis and Treatment Protocol for Novel Coronavirus Pneumonia (Trial Revision 8): mild clinical symptoms, and no findings of pneumonia in chest CT images.  -  Exclusion Criteria:1.Patients classified into Moderate, Severe, and Critical cases according to the Diagnosis and Treatment Protocol for Novel Coronavirus Pneumonia (Trial 8th Edition) 2.Females who are breast-feeding, lactating, pregnant or intending to become pregnant 3.Patients who are receiving any treatment with interferon or participating in other clinical studies of antiviral therapy.  4.Patients who are unable to collaborate due to poor mental health, suffering from psychiatric illness, or incapable of controlling themselves or expressing clearly.  5.Patients excluded in the opinion of the investigators.  -