CDC (11 Feb 2020). "COVID-19 and Your Health". Centers for Disease Control and Prevention (بالإنجليزية الأمريكية). Archived from the original on 2023-08-03. Retrieved 2021-12-09.
CDC (11 Feb 2020). "COVID-19 and Your Health". Centers for Disease Control and Prevention (بالإنجليزية الأمريكية). Archived from the original on 2023-08-03. Retrieved 2021-12-09.