• Reopening Metrics and COVID-19 Data - Updated 10/9/20

Chester County Health Department Instructional Model Metrics

Chester County Health Department Instructional Model Metrics
    • Transitioning to a more in-person instructional model can be considered when thresholds for incidence rates and positivity are met for three (3) consecutive weeks per the table above.
    • Transitioning to a more virtual instructional model can be considered when thresholds for incidence rates and positivity are met for two (2) consecutive weeks per the table above.
    • If thresholds are being met in two different Community Transmission levels (incidence rate in one level and positivity in another level) the higher transmission level is the recommended level.
    • In addition, the Chester County Health Department recommends that public and private K-12 schools in Chester and Delaware counties begin their academic year virtually and assess their ability to transition to a more in-person instructional model after October 9, 2020. This recommendation applies regardless of the current incidence rate and percent positivity at the start of the academic year.

    For additional information on these metrics and reopening schools, please see the Chester County Health Department's Public and Private School COVID-19 Guidance.

TESD Application of Metrics

    • We will continue virtual-only instruction through October 9, consistent with the Chester County Health Department (CCHD) recommendation.
    • We will carefully monitor the CCHD data for the weeks ending on September 25, October 2, and October 9.
    • We will post the updated numbers as they are received. Please be advised that the numbers are sometimes adjusted by the CCHD midweek.
    • To enable a transition to hybrid instruction on October 12, the incidence of COVID-19 per 100,000 people must remain below 80, and the percent of people who test positive must be below 10% for EACH week. In addition, other considerations could impact our timeline: 
      • If thresholds are being met at the upper extreme of this range, we will consult with the CCHD on any possible adjustments to the timeline to begin in-person instruction.
      • Other factors that influence transitioning between instructional models may be considered, such as District-specific incidence rate, widespread or significant outbreaks either within a school or the community, and staffing levels.
      • We will continue to implement recommendations for face coverings, social distancing, health screening, and cleaning. We will not transition to a level of in-person instruction that cannot support these procedures without further guidance.
    • If adjustments are needed to the timeline, we will revise this page and send notification.

Chester County Health Department COVID-19 Data

Chester County Health Department COVID-19 Data
  • Definitions:

    • Cumulative Incidence Rate per 100,000 - Cumulative incidence rate is a public health measure that summarizes the number of new COVID-19 cases. The lower the incidence rate, the lower the number of new cases. This measure is calculated by dividing the total number of confirmed and probable cases by the population for a specific time period, and is expressed as a rate per 100,000 people. The rate is calculated for 7 day periods beginning with the most current week as Week 1 and looking back three weeks.
    • Percent Positivity - Percent positivity is a public health measure that shows the percentage of all PCR COVID-19 tests performed that are positive. This measure is calculated by dividing the total number of positive PCR tests by the total number of all PCR tests (positives + negatives) for a specific time period, and is expressed as a percent. If individuals are tested multiple times, each test result is counted. The percent is calculated for 7 day periods beginning with the most current week as Week 1 and looking back three weeks.