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Healthy Communities Keep Virginia Safe II

Make a Prediction


The U.S. Centers for Disease Control and Prevention (CDC) uses two data sources for information on COVID cases: aggregate count data and in-line level (patient-level data). According to CDC, the differences between these are as follows:

  • Aggregate count data: high-level information about case and death totals.
  • Line-level (patient-level) data: specific information for each case, including: patient demographics, signs and symptoms of illness, underlying health conditions, characteristics of hospitalizations,clinical outcomes, and exposures.

Line-level data is primarily from state health departments, like the Virginia Department of Health. Collecting line-level data is substantially more involved and time-consuming than aggregate count reporting.

In October 2022, CDC changed the cadence of line-level reporting from daily to weekly. This was done to "allow for additional reporting flexibility, reduce the reporting burden on states and jurisdictions, and maximize surveillance resources."