Healthy individuals exposed directly and constantly with COVID-19 patients. COVID-19 patients who their disease is confirmed by RT-PCR test and low to moderate severity(Grade<3). Patients with O2 saturation>94 who fit outpatient protocol. Having consent for participating in study

Healthy individuals exposed directly and constantly with COVID-19 patients. COVID-19 patients who their disease is confirmed by RT-PCR test and low to moderate severity(Grade<3). Patients with O2 saturation>94 who fit outpatient protocol. Having consent for participating in study