1. World Health Organization (WHO). Weekly-epidemiological-update-on-covid-19; 2022. Available from https://www.who.int/publications/m/item/weekly-epidemiological-update-on-covid-19>. [Accessed April 04, 2022].
2. Centers for Disease Control and Prevention (CDC). News-item:Africa-identifies-first-case-of-coronavirus-disease; 2019. Available from https://africacdc.org/news-item/africa-identifies-first-case-of-coronavirus-disease-statement-by-the-director-of-africa-cdc/. Accessed April04, 2022].
3. Clinical and immunological features of severe and moderate coronavirus disease 2019;Wang;J Clin Invest.,2020
4. Protecting healthcare personnel from 2019-nCoV infection risks: lessons and suggestions;Zhang;Front Med.,2020
5. Neutralizing antibodies in patients with severe acute respiratory syndrome-associated coronavirus infection;Nie;J Infect Dis.,2004