NavGeneral InfoEmail Print Original or alternative title CDC COVID Data Tracker Provider Centers for Disease Control and Prevention (CDC)Tabulations only Geography United States of America (USA) Coverage type Country Time period covered 01/2021 - present Data type Epi surveillance Keywords COVID-19, Disease outbreaks Citation Contributors Centers for Disease Control and Prevention (CDC) Publisher Centers for Disease Control and Prevention (CDC) Suggested citation Centers for Disease Control and Prevention (CDC). United States COVID-19 Data Tracker: Variant Proportions . Atlanta, United States of America: Centers for Disease Control and Prevention (CDC). GHDx Entry last modified on: Aug 11, 2021