Figure 1.

Flow diagram depicting the process through which case surveillance (person-level) and aggregate count data are collected and received by the Centers for Disease Control and Prevention (CDC). Case surveillance data are transmitted to CDC by local, state, territorial, and tribal public health authorities. Aggregate count data were compiled by CDC COVID-19 response teams who gathered aggregate counts of cases and deaths reported by jurisdictions on their websites and validated data using daily surveys. Response teams reviewed media reports to corroborate substantial changes or discrepancies in case data posted on the jurisdictions’ websites.