Daily Case Incidence Rate Maps
The seven-day incidence is calculated by taking the total number of unique cases in each county over the past seven days, divided by seven to get a daily average, divided by the U.S. census bureau county population and multiplied by 100,000 to get the incidence per 100,000 people. The cases counted each day are based on the date an investigation was opened in the National Electronic Disease Surveillance System. Duplicate cases are removed before the calculation, so each positive case is included only once.
Note: Incidence rate maps are generated Monday - Friday. Incidence rate maps are not generated on weekends or state holidays when reporting is limited. State and local health department data will vary for a variety of reasons including data entry timing, communication processes and seven-day averaging.