Implementation of the new 2021 COVID-19 case definition in the National Notifiable Diseases Surveillance System starting September 1, 2021

Details

• Personal Author:
  Jajosky, Ruth
• Corporate Authors:
  Center for Surveillance, Epidemiology, and Laboratory Services (U.S.). Division of Health Informatics and Surveillance. Surveillance and Data Branch. ; Council of State and Territorial Epidemiologists (U.S.)
• Description:
  On June 17, 2021, the Council of State and Territorial Epidemiologists (CSTE) approved position statement 21-ID-01 titled “Update to the standardized surveillance case definition and national notification for 2019 novel coronavirus disease (COVID-19).” For cases identified beginning September 1, 2021, jurisdictions should use the case definition approved on June 17, 2021, in position statement 21-ID-01. Jurisdictions should not retroactively change the classification of cases reported prior to September 1, 2021.
  
  CDC has posted the new 2021 COVID-19 case definition to the National Notifiable Diseases Surveillance System (NNDSS) website. The new 2021 COVID-19 case definition:
  
  • updates clinical criteria indicative of infection;
  
  • refines and expands laboratory criteria to include genomic sequencing;
  
  • updates epidemiologic linkage criteria and the definition of close contact;
  
  • acknowledges testing performed in non-traditional settings such as work sites, temporary testing sites, and homes;
  
  • specifies criteria for enumerating new cases in persons previously classified as a probable or confirmed case (i.e., reinfections); and
  
  • clarifies that a case meeting clinical criteria and epidemiologic linkage with no confirmatory or presumptive laboratory evidence for SARS-CoV-2 is classified as probable.
  
  The 2021 COVID-19 case definition replaces the previous interim 2020 COVID-19 case definition described in CSTE position statement Interim-20-ID-02, which was approved on August 5, 2020. Current and historical COVID-19 case definitions are available on the NNDSS website.
  
  As a reminder, the event code for COVID-19 is 11065 and is listed in the 2021 NNDSS event code list. COVID-19 continues to be designated immediately nationally notifiable. When CDC begins publishing COVID-19 data in the NNDSS tables, CDC will include case counts for confirmed and probable cases.
  
  Jajosky_2021_State_Epi_Letter_New_2021_COVID-19_Case_Definition_for_NNDSS_WebSite_Cleared_08242021.pdf
  
  
• Subjects:
  Communicable Diseases/epidemiology COVID-19 Data Collection Disease Notification Incidence Population Surveillance
• Document Type:
  Pamphlet (or booklet)
• Name as Subject:
  National Notifiable Diseases Surveillance System
• Place as Subject:
  United States
• Pages in Document:
  1 numbered page
• Collection(s):
  Stephen B. Thacker CDC Library
• Main Document Checksum:
  urn:sha256:e534c23d2bbf7cb940eb5c6f7a7a732e8c3685253523c85904b1e22f3ea3b06d
• Download URL:
  https://stacks.cdc.gov/view/cdc/132377/cdc_132377_DS1.pdf
• File Type:
  [PDF - 141.38 KB ]