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Implementation of the new 2021 COVID-19 case definition in the National Notifiable Diseases Surveillance System starting September 1, 2021
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08/24/2021
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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
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