Viral PCR Percent Positive Rate Jumps To 7.5%

Viral PCR Percent Positive Rate Jumps To 7.5%
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Viral PCR Percent Positive Rate Jumps to 7.5% as Testing Volume Continues to Drop

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The CV19 Lab Testing Dashboard™ powered by hc1 provides local lab testing insights that include state, county, and sub-county views of Local Risk Index, COVID-19 testing rates and results, and key demographic filters for those tested (age, gender). Data used in the dashboard comes from more than 20,000 lab ordering locations from a coalition of laboratories performing up to 40% of the nation’s laboratory testing.

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  • Percent positivity rates were 12% for antibody testing and 7.5% for Viral PCR testing.
  • Viral PCR and Antibody Serology testing volumes were down again this week.
  • Texas has four counties on the hc1 Local Risk Index Top Counties.
  • hc1 Local Risk Index trends show rising risk for infection in Florida, Colorado, Massachusetts, Minnesota, and Michigan.
  • To access the hc1 CV19 Lab Testing Dashboard, register for free at
  • An index of Weekly COVID-19 Lab Testing Insights can now be accessed at

Viral PCR Testing

As of October 29, 2020, the national percent positivity rate for COVID-19 Viral PCR testing increased for the second consecutive week to 7.5%, and testing volume decreased for the fifth week. This can be seen in the following chart showing the weekly national trend in SARS-CoV-2 Viral PCR testing volume and % detected rate among the hc1 CV19 Coalition of Laboratories, which represents approximately 40% of all CV19 testing nationwide.

Viral PCR

Antibody Serology Testing

The weekly national trend in SARS-CoV-2 Antibody Serology testing volume and % detected rate, as shown in the following chart, shows testing volume dropped slightly again this week, but remains low in comparison to viral testing volume. Percent positivity held steady at 12% after increasing last week.

Viral PCR

Local Risk Index

The hc1 Local Risk Index trends for the week of October 26 show rising risk for infection in several states, including Florida, Colorado, Massachusetts, Minnesota, and Michigan. Wisconsin is back for the third week with counties on the list of Top 10 counties with the largest magnitude of change in infection rates over last week, as determined by calculating the LRI x ‘7vs7’ rate*. Rounding out the list are counties in Missouri, Mississippi, Ohio, Arizona and Tennessee. (Dr. Peter Plantes offers deeper insights into each week’s hc1 Local Risk Index Top Counties here:

Viral PCR

Criteria for Top Counties:

  • A population greater than 100,000
  • More than 100 COVID-19 viral tests performed in the past week
  • An hc1 Local Risk Index™ greater than 7
  • An acceleration factor of LRI equal to or greater than 1.5

For a community of 100,000, a rapid rise in the presence of positive COVID-19 viral testing is the earliest indicator that ER, hospital, ICU, ventilators, and other medical resources (clinical providers, PPE, facilities, etc.) will be heavily taxed in the next 10 to 21 days. The community that has the largest acceleration in positive tests week-over-week will see the fastest rise in the magnitude of COVID-19 cases.

* This brief video provides an explanation of how to utilize the LRI to track specific regions.

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