Data and Benchmarks
Knox County COVID-19 Data
(Data is updated as of )
These numbers, with the exception of the map, are updated daily at 11 a.m. EDT. State numbers are updated at 2 p.m. CDT daily; there may be a lag in reporting of cumulative numbers at the state level.
Please note, these data are meant to provide a rough estimate of testing volume. Due to different source data, numbers may differ slightly from day to day. This data is subject to change.
Cases:
i. UPDATE: Effective Sept. 4, “Inactive” cases will be reported instead of “Recovered” cases. “Inactive” cases include those who are 14 days or more beyond their illness onset date (or, for asymptomatic cases, their specimen collection date). This is in alignment with the Tennessee Department of Health, better reflects what is now understood about the infectious period of COVID-19 and is a better reflection of the meaning of this category. Recent data from CDC show most patients with COVID-19 are no longer infectious after 10 days, although they may have lingering symptoms for some time. While we require that all cases isolate at home for at least 10 days, the additional four days in this definition account for those cases who experience symptoms for a longer time frame and require isolation until the symptoms resolve. This change from reporting “Recovered” to “Inactive” does not affect isolation and quarantine requirements for individuals.
ii. Probable cases are those that:
‐ Meet clinical criteria AND epidemiologic evidence with no confirmatory laboratory testing performed for COVID-19
‐ Meet presumptive laboratory evidence AND either clinical criteria OR epidemiologic evidence.
Probable cases are included in demographic data.
iii. Information about hospitalization status is gathered at the time of diagnosis, therefore this information may be incomplete. This number indicates the number of Knox County residents that were ever hospitalized during their illness.
iv. This figure represents only Knox County residents currently hospitalized at any hospital.
Gender:
* The National Electronic Disease Surveillance System Base System (NBS) is a CDC-developed information system that helps public health departments manage reportable disease data and send data to CDC.
Age Category:
Race and Ethnicity:
* Demographics were calculated based on laboratory reports that have race/ethnicity data available. Not all negative tests have demographic data available and should not be interpreted as a count of negative tests.
COVID-19 Cases, Hospitalizations and Deaths in Knox County
* Hospitalizations, Cases and Deaths may not add up to the daily reported number of cases for race and ethnicity. Rates can not be calculated for individuals with unknown race or ethnicity.
* Population estimates updated from 2018 to 2019 values
** Total includes probable cases
COVID-19 Cumulative Case Counts per Day, including Growth Rate
* Due to scheduled maintenance on the statewide data reporting system, NBS, over the weekend, case counts on 11/2/20 also include new cases that came in on 11/1/20.
* This data does not include probable cases, only confirmed cases.
Click here for more information about the data.Data Source: National Electronic Disease Surveillance System Base System (NBS), hospital reporting, laboratory reporting.
* Growth rate is represented on the above graph. Scroll your mouse over each bar for data on previous cases, new cases, total cases and growth rate.
New Cases per Day with Trendline
* Due to scheduled maintenance on the statewide data reporting system, NBS, over the weekend, case counts on 11/2/20 also include new cases that came in on 11/1/20.
* This data does not include probable cases, only confirmed cases.
Number of Cases by Specimen Collection Date
* This information comes from NBS (NEDSS based system) and reflects the date the individual was tested.
Knox County Cases - March 1 to January 13 *
(Data is reported as of January 13, 2021).
* Some addresses have not yet been provided through the case investigation; therefore, they aren’t reflected in the map.
* Map will be updated every Friday
Benchmarks
(Data is updated as of )
The focus of the benchmarks outlined here is on assessing the local ability to manage an increase in cases while preventing the unobstructed growth of transmission.
To more visually represent how the benchmarks are being attained, a traffic light is being utilized to depict the status of each benchmark.
Red signifies the trends are not moving towards benchmark attainment and may indicate adjustments need to be made.
Yellow signifies the trends are moving towards/away from reaching benchmark attainment. Yellow indicates caution.
Green signifies that the benchmark is currently met.
As new challenges and opportunities arise, it may be appropriate for the Knox County Health Department and the Knox County Board of Health to consider additional benchmarks or to modify the current criteria.
This section of our data will be updated weekly.
1) Sustained reduction or stability in new cases for 14 days.
For more information about the benchmark, click here.
A sustained reduction or stability in new cases for 14 days is an indicator for movement towards the next phase. Although most cases occur within 5-7 days of exposure, almost all are evident by 14 days. Conversely, a statistically significant increase in new cases will require a full assessment of the current situation and other benchmarks. It may mean we need to make mid-phase adjustments or even mean we need to revert to an earlier phase of opening. Certain increases, such as a significant increase in new cases over the course of five days, would be a cause for thorough review. However, phase decisions should reflect a precise understanding of local trends.
- Green: No three-day shifts of 1.5 standard deviations above a rolling mean (based on data from the previous 14 days)
- Yellow: Three-day shifts detected above 1.5 but not greater than 3.0 standard deviations above a rolling mean (based on data from the previous 14 days)
- Red: Three-day shifts detected above 3.0 standard deviations above a rolling mean (based on data from the previous 14 days)
A sustained reduction or stability in new cases for 14 days is an indicator for movement towards the next phase. Although most cases occur within 5-7 days of exposure, almost all are evident by 14 days. Conversely, a statistically significant increase in new cases will require a full assessment of the current situation and other benchmarks. It may mean we need to make mid-phase adjustments or even mean we need to revert to an earlier phase of opening. Certain increases, such as a significant increase in new cases over the course of five days, would be a cause for thorough review. However, phase decisions should reflect a precise understanding of local trends.
- Green: No three-day shifts of 1.5 standard deviations above a rolling mean (based on data from the previous 14 days)
- Yellow: Three-day shifts detected above 1.5 but not greater than 3.0 standard deviations above a rolling mean (based on data from the previous 14 days)
- Red: Three-day shifts detected above 3.0 standard deviations above a rolling mean (based on data from the previous 14 days)
COVID-19 Cumulative Case Counts per Day, including Growth Rate
* This data does not include probable cases, only confirmed cases.
Click here for more information about the data.Data Source: National Electronic Disease Surveillance System Base System (NBS), hospital reporting, laboratory reporting.
* Growth rate is represented on the above graph. Scroll your mouse over each bar for data on previous cases, new cases, total cases and growth rate.
2) Community-wide sustained and increased diagnostic testing with consistent or decreased test result reporting turnaround time
For more information about the benchmark, click here.
For this benchmark, it is important that test results be available quickly, ideally within 24 hours so that COVID-positive people can isolate and KCHD can begin contact tracing to rapidly identify close contacts and those who should go into quarantine. However, given the current national laboratory processing capacity, consideration should be given to reporting timeframes that do not exceed the current five-day average. Additionally, in an effort to contain the spread of the virus, KCHD will prioritize rapid contract tracing for probable cases who are waiting on lab results to quickly quarantine their contacts, which reduces the risk of ongoing community transmission.
- Green: Sustained or increased diagnostic testing and sustained or decreased test result reporting turnaround time
- Yellow: Three-day negative shift detected between 1.5 but no greater than 3.0 standard deviations below a rolling mean (based on data from the previous 14 days) and result reporting turnaround time exceeds weekly average testing report time
- Red: Three-day negative shift detected more than 3.0 standard deviations below the rolling mean (based on data from the previous 14 days) and result reporting turnaround time exceeds weekly average testing report time
For this benchmark, it is important that test results be available quickly, ideally within 24 hours so that COVID-positive people can isolate and KCHD can begin contact tracing to rapidly identify close contacts and those who should go into quarantine. However, given the current national laboratory processing capacity, consideration should be given to reporting timeframes that do not exceed the current five-day average. Additionally, in an effort to contain the spread of the virus, KCHD will prioritize rapid contract tracing for probable cases who are waiting on lab results to quickly quarantine their contacts, which reduces the risk of ongoing community transmission.
- Green: Sustained or increased diagnostic testing and sustained or decreased test result reporting turnaround time
- Yellow: Three-day negative shift detected between 1.5 but no greater than 3.0 standard deviations below a rolling mean (based on data from the previous 14 days) and result reporting turnaround time exceeds weekly average testing report time
- Red: Three-day negative shift detected more than 3.0 standard deviations below the rolling mean (based on data from the previous 14 days) and result reporting turnaround time exceeds weekly average testing report time
Tests Conducted for Knox County Residents
*All data for this time period may not be reported yet.
*All data for this time period may not be reported yet.
*October 14, 2020: To better coincide with the new positivity rate added to the website, KCHD is now using Tennessee Department of Health data (PCR tests only) to calculate testing volume in Knox County. Lag times will still be calculated using a sample data set from Knox County. All values have been updated from April 1, 2020, when testing data became available.
Average Time (Days) between Specimen Collection and Lab Report Data
*All data for this time period may not be reported yet.
* This information is based average time between specimen collection and lab report date for tests conducted in Knox County.
3) Sustained or increased public health capability
For more information about the benchmark, click here.
Beginning mid-November, due to the growing volume of cases, KCHD has partnered with the Tennessee Department of Health (TDH) to transition some case investigation and contact tracing responsibility to the state. This type of partnership between local health departments and TDH is occurring across the state in order to try and meet the growing demand.
Of the cases that fall within the prioritization structure, the goal remains to initiate investigations for new cases within 24 hours of notification and initiate close contact investigations within 48 hours of notification. A traffic light color for this benchmark will be assigned based on the below factors, in addition to KCHD’s continuous assessment of our internal ability, as well as TDH’s ability, to initiate investigations for local cases and contacts.
- Green: Initiate investigations for 97 to 100 percent of new cases within 24 hours from KCHD receiving notification of the case, and contact tracing is initiated within 48 hours for 97 to 100 percent of close contacts
- Yellow: Initiate investigations for 95 to 96.9 percent of new cases within 24 hours from KCHD receiving notification of the case, and contact tracing is initiated within 48 hours for 95 to 96.9 percent of close contacts
- Red: Initiate investigations for less than 95 percent of new cases within 24 hours from KCHD receiving notification of the case, and contact tracing is initiated within 48 hours for less than 95 percent of close contacts
Beginning mid-November, due to the growing volume of cases, KCHD has partnered with the Tennessee Department of Health (TDH) to transition some case investigation and contact tracing responsibility to the state. This type of partnership between local health departments and TDH is occurring across the state in order to try and meet the growing demand.
Of the cases that fall within the prioritization structure, the goal remains to initiate investigations for new cases within 24 hours of notification and initiate close contact investigations within 48 hours of notification. A traffic light color for this benchmark will be assigned based on the below factors, in addition to KCHD’s continuous assessment of our internal ability, as well as TDH’s ability, to initiate investigations for local cases and contacts.
- Green: Initiate investigations for 97 to 100 percent of new cases within 24 hours from KCHD receiving notification of the case, and contact tracing is initiated within 48 hours for 97 to 100 percent of close contacts
- Yellow: Initiate investigations for 95 to 96.9 percent of new cases within 24 hours from KCHD receiving notification of the case, and contact tracing is initiated within 48 hours for 95 to 96.9 percent of close contacts
- Red: Initiate investigations for less than 95 percent of new cases within 24 hours from KCHD receiving notification of the case, and contact tracing is initiated within 48 hours for less than 95 percent of close contacts
Contact Tracing Response Time
Due to recent process changes and the volume of cases, the way we represented this benchmark previously is undergoing changes. Based on KCHD's internal assessment of our current ability, we are classifying this benchmark as red.
Public Health Capacity
The following table provides additional information on public health capacity for the community’s information. KCHD consistently trains and operates under a Public Health Investigation Team (PHIT) model. We have a core team that responds to outbreaks regularly. This team can expand beyond the core team to accommodate outbreaks of greater scale. With an average of 12 outbreaks a year, this team is ready to respond and requires little training in interviewing, contact investigation or contact monitoring. Beyond the PHIT teams, other KCHD staff have been identified to respond in this capacity if needed. That said, given the scale of the pandemic, KCHD anticipates employers and medical facilities also will be asked to assist with contact tracing and monitoring for the benefit of the public. Cases and contacts will be provided instructions on how to protect themselves and others while in isolation and quarantine.