Covid-19 case diagnosis (conversion from being asymptomatic pre-treatment to symptomatic post-treatment for COVID-19) by using a questionnaire for screening clinical symptoms of COVID-19; at baseline; and during the follow up at 7; 14; 30 and 90 days . All clinically diagnosed COVID-19 cases will be confirmed by serologic IgM and IgG anti-SARS-CoV2 test at 14 days post-initial symptoms.

Covid-19 case diagnosis (conversion from being asymptomatic pre-treatment to symptomatic post-treatment for COVID-19) by using a questionnaire for screening clinical symptoms of COVID-19; at baseline; and during the follow up at 7; 14; 30 and 90 days . All clinically diagnosed COVID-19 cases will be confirmed by serologic IgM and IgG anti-SARS-CoV2 test at 14 days post-initial symptoms.