CSTE Interim position statement 20-ID-01 (COVID-19 case definition)
Summary
Position statement Interim-20-ID-01 of the Council of State and Territorial Epidemiologists, from its Infectious Disease committee, titled Standardized surveillance case definition and national notification for 2019 novel coronavirus disease (COVID-19). The statement creates a standardized case definition for COVID-19, including asymptomatic infections caused by SARS-CoV-2, and recommends adding COVID-19 to the Nationally Notifiable Condition List as immediately notifiable, urgent (within 24 hours). It sets out recommended data sources, clinical, laboratory, epidemiologic linkage and vital records criteria, and defines close contact as being within 6 feet for 10 minutes to 30 minutes or more depending on exposure. It classifies cases as confirmed or probable and recommends both statuses be included in released case counts. A technical supplement tabulates the classification criteria.
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Interim-20-ID-01
Committee: Infectious Disease
Title: Standardized surveillance case definition and national notification for 2019 novel coronavirus
disease (COVID-19)
☐Check this box if this position statement is an update to an existing standardized surveillance case definition and
include the most recent position statement number here: N/A .
Synopsis: This position statement creates a standardized case definition for 2019 novel coronavirus disease
(COVID-19) including asymptomatic infections caused by Severe Acute Respiratory Syndrome Coronavirus-2
(SARS-CoV-2) and adds COVID-19 to the list of nationally notifiable conditions.
I. Statement of the Problem
Introduction of SARS-CoV-2, the virus that causes 2019 novel coronavirus disease (COVID-19), into the United
States has resulted in the need for standardized surveillance to assist in understanding the transmission and
epidemiology of the disease in U.S. jurisdictions. Public health agencies are investigating reported respiratory
illnesses and identifying infected people (cases) through laboratory testing. Nationwide standardized surveillance
is necessary to provide consistent case identification and classification, measure the potential burden of illness,
characterize the epidemiology of medically attended and moderate to severe COVID-19 in the United States,
detect community transmission, and inform public health response to clusters of illness and efficacy of population-
based non-pharmaceutical interventions on the epidemic.
II. Background and Justification
In late December 2019, investigation of a cluster of pneumonia cases of unknown origin in Wuhan, China resulted
in identification of a novel coronavirus. The virus is distinct from both SARS-CoV and MERS-CoV, although closely
related. Early epidemiologic findings indicate COVID-19 may be less severe1 than SARS or MERS, but evidence
suggests that the virus is more contagious than its predecessors. SARS-CoV-2 is a newly identified pathogen and
it is assumed there is no existing human immunity to the virus. Everyone is assumed to be susceptible, although
there may be risk factors that increase an individual’s illness severity.
Based on epidemiologic reports of the outbreak in China, those at highest risk for severe disease and death
include people aged over 60 years and those with underlying conditions such as hypertension, diabetes,
cardiovascular disease, chronic respiratory disease, and cancer. Disease in children appears to be relatively mild,
and growing evidence that a significant proportion of infections across all age groups are asymptomatic.
Cases of COVID-19 in China and the initial U.S. cases in early March 2020 have been clustered. Most cases in
China occurred in households and in Washington, for example, a significant cluster was associated with a long-
term care facility. However, cases have been reported in the United States with no direct epidemiologic link to
confirmed cases. Ongoing surveillance of illness, risk factors, and epidemiologic linkage is needed to characterize
the disease transmission in the United States, and to inform intervention and mitigation strategies.
Epidemiological reports from the field are demonstrating a growing importance of presymptomatic and
asymptomatic infections from two lines of evidence: the serial interval of COVID-19 appears to be close to or
shorter than its median incubation period and clusters linked to presymptomatic and asymptomatic index cases4, 5.
CSTE realizes that field investigations will involve evaluations of persons with no symptoms and these individuals
will need to be counted as cases.
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III. Statement of the desired action(s) to be taken
CSTE recommends the following actions:
1. Implement a standardized surveillance case definition for COVID-19.
A. Utilize standard sources (e.g. reporting*) for case ascertainment for COVID-19. Surveillance for
COVID-19 should use the recommended sources of data to the extent of coverage presented in
Section V.
B. Utilize standardized criteria for case ascertainment for COVID-19 presented in Section VI and
Table VI in Technical Supplement.
C. Utilize standardized criteria for case classification for COVID-19 presented in Sections VII and
Table VII in Technical Supplement.
2. Utilize standardized criteria for case ascertainment and classification (based on Sections VI and VII and
Technical Supplement) for COVID-19 and add COVID-19 to the Nationally Notifiable Condition List
☐ Immediately notifiable, extremely urgent (within 4 hours)
☒ Immediately notifiable, urgent (within 24 hours)
☐ Routinely notifiable
☐ No longer notifiable
3. CSTE recommends that all States and Territories enact laws (statute or rule/regulation as appropriate) to
make COVID-19 reportable in their jurisdiction. Jurisdictions (e.g. States and Territories) conducting
surveillance (according to these methods) should submit case notifications** to CDC.
4. Expectations for Message Mapping Guide (MMG) development for a newly notifiable condition: the
National Notifiable Diseases Surveillance System (NNDSS) is transitioning to HL7-based messages for
case notifications; the specifications for these messages are presented in MMGs. When CSTE
recommends a new condition be made nationally notifiable, CDC must obtain Office of Management and
Budget Paperwork Reduction Act (OMB PRA) approval prior to accepting case notifications for the new
condition. Under anticipated timelines, notification using the Generic V2 MMG would support transmission
of the basic demographic and epidemiologic information common to all cases and could begin with the
new MMWR year following the CSTE annual conference. Input from CDC programs and CSTE would
prioritize development of a disease-specific MMG for the new condition among other conditions waiting for
MMGs.
5. CDC should publish data on COVID-19 as appropriate (see Section IX).
CSTE recommends the following case statuses be included in the CDC Print Criteria:
☒Confirmed
☒Probable
☐Suspect
☐Unknown
6. CSTE recommends that all jurisdictions (e.g. States, Localities, or Territories) with legal authority to
conduct public health surveillance follow the recommended methods outlined in this recommendation and
in the accompanying standardized surveillance position statement.
*Reporting: process of a healthcare provider or other entity submitting a report (case information) of a condition under public health surveillance TO local,
state, or territorial public health. Note: notification is addressed in a Nationally Notifiable Conditions Recommendation Statement and is the process of a local,
state, or territorial public health authority submitting a report (case information) of a condition on the Nationally Notifiable Conditions List TO CDC.
**Notification: process of a local or state public health authority submitting a report (case information) of a condition on the Nationally Notifiable Conditions List
to CDC.
IV. Goals of Surveillance
Surveillance of COVID-19 is necessary to characterize the epidemiology of the disease in the United States, to
measure the burden of disease in the United States health system, and to inform public health action.
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V. Methods for Surveillance: Surveillance for COVID-19 should use the recommended sources of data and
the extent of coverage listed in Table V.
Table V. Recommended sources of data and extent of coverage for ascertainment of cases
of COVID-19
Coverage
Source of data for case ascertainment Population-wide Sentinel sites
Clinician reporting X
Laboratory reporting X
Reporting by other entities (e.g., hospitals,
veterinarians, pharmacies, poison centers), specify: X
Hospitals
Death certificates X
Hospital discharge or outpatient records X
Data from electronic medical records X
Telephone survey
School-based survey
Other, specify: diagnosis codes, autopsy reports X
As commercial laboratories implement testing for SARS-CoV-2, laboratory reporting will be the most common
source of data. Healthcare providers and facilities who diagnose or become aware of clinically compatible COVID-
19 cases should report them to public health authorities.
VI. Criteria for case ascertainment
A. Narrative: A description of suggested criteria for case ascertainment of a specific condition.
Symptoms of COVID-19 are non-specific and the disease presentation can range from no symptoms
(asymptomatic) to severe pneumonia and death. COVID-19 is a mild to moderate illness for approximately 80% of
individuals evaluated with the disease; 15% are severe infection requiring supplemental oxygen; and 5% are
critical infections requiring mechanical ventilation.2 People with COVID-19 generally develop signs and symptoms,
including mild respiratory symptoms and fever ~5 days after infection (mean incubation period 5-6 days, range 1-
14 days).3
A1. Clinical Criteria for Reporting
In outpatient or telehealth settings at least two of the following symptoms: fever (measured or
subjective), chills, rigors, myalgia, headache, sore throat, new olfactory and taste disorder(s)
OR
• at least one of the following symptoms: cough, shortness of breath, or difficulty breathing
OR
Severe respiratory illness with at least one of the following:
• Clinical or radiographic evidence of pneumonia, or
• Acute respiratory distress syndrome (ARDS).
AND
No alternative more likely diagnosis
A2. Laboratory Criteria for Reporting
● Detection of SARS-CoV-2 RNA in a clinical specimen using a molecular amplification detection
test.
● Detection of specific antigen in a clinical specimen.
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● Detection of specific antibody in serum, plasma, or whole blood indicative of a new or recent
infection.*
*serologic methods for diagnosis are currently being defined
A3. Epidemiologic Linkage Criteria for Reporting
● In a person with clinically compatible symptoms with one or more of the following exposures in the 14
days before onset of symptoms:
o Travel to or residence in an area with sustained, ongoing community transmission of
SARS-CoV-2; OR
o Close contact** with a person diagnosed with COVID-19; OR
o Member of a risk cohort as defined by public health authorities during an outbreak.
**Close contact is defined as being within 6 feet for a period of 10 minutes to 30 minutes or more
depending upon the exposure. In healthcare settings, this may be defined as exposures of
greater than a few minutes or more. Data are insufficient to precisely define the duration of
exposure that constitutes prolonged exposure and thus a close contact.
A4. Vital Records Criteria for Reporting
A person whose death certificate lists COVID-19 disease or SARS-CoV-2 as a cause of death or a
significant condition contributing to death.
A5. Other Criteria for Reporting
Autopsy findings consistent with pneumonia or acute respiratory distress syndrome without an identifiable
cause.
B. Disease-specific data elements to be included in the initial report
In addition to patient demographics, the following disease-specific data elements are expected to be included in all
reports to public health agencies:
Laboratory Information:
● Specimen type
● Collection date
● Laboratory test performed
● Results
Clinical Information
● Description of clinical symptoms and signs of illness, or if asymptomatic
● Date of illness onset
● Hospitalization
● Underlying diseases or co-infections
Epidemiologic Information
● Known contact or linkage to COVID-19 cases
● Recent travel to or residence in an area with sustained, ongoing community transmission of SARS-CoV-2
● Member of a risk cohort as defined by public health authorities during an outbreak
VII. Case Definition for Case Classification
A. Narrative: Description of criteria to determine how a case should be classified.
A1. Clinical Criteria
At least two of the following symptoms: fever (measured or subjective), chills, rigors, myalgia,
headache, sore throat, new olfactory and taste disorder(s)
OR
At least one of the following symptoms: cough, shortness of breath, or difficulty breathing
OR
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Severe respiratory illness with at least one of the following:
• Clinical or radiographic evidence of pneumonia, or
• Acute respiratory distress syndrome (ARDS).
AND
No alternative more likely diagnosis
A2. Laboratory Criteria
Laboratory evidence using a method approved or authorized by the FDA or designated authority:
Confirmatory laboratory evidence:
● Detection of SARS-CoV-2 RNA in a clinical specimen using a molecular amplification detection
test
Presumptive laboratory evidence:
● Detection of specific antigen in a clinical specimen
● Detection of specific antibody in serum, plasma, or whole blood indicative of a new or recent
infection*
*serologic methods for diagnosis are currently being defined
A3. Epidemiologic Linkage
One or more of the following exposures in the 14 days before onset of symptoms:
● Close contact** with a confirmed or probable case of COVID-19 disease; or
● Close contact** with a person with:
o clinically compatible illness AND
o linkage to a confirmed case of COVID-19 disease.
● Travel to or residence in an area with sustained, ongoing community transmission of SARS-CoV-
2.
● Member of a risk cohort as defined by public health authorities during an outbreak.
**Close contact is defined as being within 6 feet for at least a period of 10 minutes to 30 minutes or
more depending upon the exposure. In healthcare settings, this may be defined as exposures of
greater than a few minutes or more. Data are insufficient to precisely define the duration of
exposure that constitutes prolonged exposure and thus a close contact.
A4. Vital Records Criteria
A death certificate that lists COVID-19 disease or SARS-CoV-2 as a cause of death or a significant
condition contributing to death.
A5. Case Classifications
Confirmed:
• Meets confirmatory laboratory evidence.
Probable:
• Meets clinical criteria AND epidemiologic evidence with no confirmatory laboratory testing
performed for COVID-19.
• Meets presumptive laboratory evidence AND either clinical criteria OR epidemiologic
evidence.
• Meets vital records criteria with no confirmatory laboratory testing performed for COVID-
19.
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B. Criteria to distinguish a new case of this disease or condition from reports or notifications which should
not be enumerated as a new case for surveillance
N/A until more virologic data are available.
VIII. Period of Surveillance
Ongoing
IX. Data sharing/release and print criteria
CSTE recommends the following case statuses* be included in the ‘case’ count released outside of the public
health agency:
☒Confirmed
☒Probable
☐Suspect
☐Unknown
* Which case statuses are included in the case counts constitute the “print criteria.”
Jurisdictions (e.g., States and Territories) conducting surveillance under this case definition can voluntarily submit
de-identified case information to CDC, if requested and in a mutually agreed upon format.
Production of national data summaries and national data re-release for non-NNCs:
● Prior to release of national data summaries CDC should follow the CDC/ATSDR Policy on
Releasing & Sharing Data, issued on April 16, 2003 and referenced in 11-SI-01 and
custodians of such data should consult the CDC-CSTE Intergovernmental Data Release
Guidelines Working Group report (www.cste2.org/webpdfs/drgwgreport.pdf) which
contains data release guidelines and procedures for CDC programs re-releasing state,
local, or territorial-provided data.
● CDC programs have a responsibility, in collaboration with states, localities, and territories,
to ensure that CDC program-specific data re-release procedures meet the needs of those
responsible for protecting data in the states and territories.
● In accordance with CSTE Position Statement 11-SI-04, CDC should apply the Revised
Guidelines for Determining Residency for analyses and counting cases.
X. Revision History
This is the first standardized surveillance position statement for COVID-19 and SARS-CoV-2 infection.
XI. References
1. The Novel Coronavirus Pneumonia Emergency Response Epidemiology Team. The Epidemiological
Characteristics of an Outbreak of 2019 Novel Coronavirus Diseases (COVID-19) in China]. Zhonghua Liu
Xing Bing Xue Za Zhi. 2020;41(2):145–151. DOI:10.3760/cma.j.issn.0254-6450.2020.02.003.
2. WHO SIT REP https://www.who.int/docs/default-source/coronaviruse/situation-reports/20200306-sitrep-46-
covid-19.pdf?sfvrsn=96b04adf_2
3. The Epidemiological Characteristics of an Outbreak of 2019 Novel Coronavirus Diseases (COVID-19) in
China]. Zhonghua Liu Xing Bing Xue Za Zhi. 2020;41(2):145–151. DOI:10.3760/cma.j.issn.0254-
6450.2020.02.003.
4. Serial interval of novel coronavirus (COVID-19) infections. Hiroshi Nishiura, Natalie M. Linton, Andrei R.
Akhmetzhanov PII: S1201-9712(20)30119-3 DOI: https://doi.org/10.1016/j.ijid.2020.02.060 Reference: IJID
4006 To appear in: International Journal of Infectious Diseases, Accepted Date: 27 February 2020
5. Presymptomatic Transmission of SARS-CoV-2 — Singapore, January 23–March 16, 2020. Morbidity and
Mortality Weekly Report Early Release / Vol. 69 April 1, 2020 U.S. Department of Health and Human
Services Centers for Disease Control and Prevention. Wycliffe E. Wei; Zongbin Li; Calvin J. Chiew; Sarah
E. Yong; Matthias P. Toh; Vernon J. Lee
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XII. Coordination
Subject Matter Expert (SME) Consultants:
(1) Judith C Lovchik, PhD D(ABMM) (5) Sandra W. Roush, MT, MPH
Assistant Commissioner Surveillance Officer
Public Health Protection and Laboratory National Center for Immunization and
Services Respiratory Diseases
Indiana State Department of Health Centers for Disease Control and
317-921-5808 Prevention
jlovchik@isdh.in.gov 404-639-8741
sroush@cdc.gov
(2) Kirsten St. George, MAppSc, PhD
Chief, Viral Diseases (6) Tom Shimabukuro, MD, MPH, MBA
Wadsworth Center Immunization Safety Office
New York State Department of Health Division of Healthcare Quality Promotion
(518) 474 4177 National Center for Emerging and
Kirsten.St.George@health.ny.gov Zoonotic Infectious Diseases
Centers for Disease Control and
(3) Susan I. Gerber, MD Prevention
Chief, Respiratory Viruses Branch 404-498-0679
Division of Viral Diseases TShimabukuro@cdc.gov
National Center for Immunization and
Respiratory Diseases
Centers for Disease Control and
Prevention
404-639-3002
bhx1@cdc.gov
(4) Aron J. Hall, DVM, MSPH, Dipl ACVPM
Division of Viral Diseases
National Center for Immunization and
Respiratory Diseases
Centers for Disease Control and
Prevention
(404) 639-1869
ajhall@cdc.gov
Agencies for Response
(1) Centers for Disease Control and Prevention
Robert R. Redfield, MD
Director
1600 Clifton Road NE
Atlanta, GA 30329
(404) 639-7000
olx1@cdc.gov
Agencies for Information:
N/A
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XIII. Author Information
Submitting and Presenting Author:
(1) Kathryn Turner, PhD MPH
Deputy State Epidemiologist
Idaho Division of Public Health
Idaho Department of Health and Welfare
450 West State Street, 4th Floor
Boise, ID 83702
208-334-5939
Kathryn.Turner@dhw.idaho.gov
Co-Author(s):
(1) ☒Active Member (3) ☒Active Member
Sherri L. Davidson, Ph.D., M.P.H. Sarah Y. Park, MD, FAAP
Interim State Epidemiologist State Epidemiologist
Epidemiology, Surveillance, & Informatics Chief, Disease Outbreak Control Division
Infectious Diseases & Outbreaks Division Hawaii Department of Health
Alabama Department of Public Health 1250 Punchbowl Street, Rm 443
201 Monroe St, Suite 1464 Honolulu, HI 96813
Montgomery, AL 36104 808.587.6845
334-206-2050 sarah.park@doh.hawaii.gov
sherri.davidson@adph.state.al.us
(4) ☒Active Member
(2) ☒Active Member
Caitlin S. Pedati MD, MPH, FAAP
Jim Collins MPH, RS Medical Director & State Epidemiologist
Director, Communicable Disease Division Iowa Department of Public Health
Michigan Department of Health and 321 E. 12th Street
Human Services Lucas State Office Bldg.
333 S. Grand Ave. Des Moines, IA 50319
Lansing, MI 48909 Office: 515-281-3826
517-284-4911 caitlin.pedati@idph.iowa.gov
CollinsJ12@michigan.gov
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Technical Supplement
Table VI. Table of criteria to determine whether a case should be reported to public health authorities.
Criterion COVID-19
Clinical Criteria for Reporting
Patient seen in outpatient or telehealth setting N N
At least two of the following symptoms: O O
• Fever (measured or subjective)
• Chills
• Rigors
• Myalgia
• Headache
• Sore throat
• New olfactory and taste disorder(s)
At least one of the following symptoms: O O
• Cough
• Shortness of breath
• Difficulty breathing
Clinical or radiographic evidence of pneumonia O O
Acute respiratory distress syndrome (ARDS) O O
No alternative more likely diagnosis N N N N
Laboratory Criteria for Reporting
Detection of SARS-CoV-2 RNA in a clinical specimen using a molecular S
amplification detection test
Detection of specific antigen in a clinical specimen S
Detection of specific antibody in serum, plasma, or whole blood indicative of a S
new or recent infection*
Epidemiological Linkage Criteria for Reporting
Travel to an area with sustained, ongoing community transmission of SARS- O O
CoV-2 in the 14 days prior to onset of symptoms
Residence in an area with sustained, ongoing community transmission of SARS- O O
CoV-2 in the 14 days prior to onset of symptoms
Close contact** in the 14 days prior to onset of symptoms with a person O O
diagnosed with COVID-19
Member of a risk cohort group, as defined by public health authorities during an O O
outbreak, in the 14 days prior to onset of symptoms
Vital Records Criteria for Reporting
A person whose death certificate lists COVID-19 disease or SARS-CoV-2 as a S
cause of death or a significant condition contributing to death
Other Criteria for Reporting
Autopsy findings consistent with pneumonia or acute respiratory distress S
syndrome without an identifiable cause
Notes:
S = This criterion alone is SUFFICIENT to report a case.
N = All “N” criteria in the same column are NECESSARY to report a case.
O = At least one of these “O” (ONE OR MORE) criteria in each category (categories=clinical evidence, laboratory evidence, and
epidemiological evidence) in the same column—in conjunction with all “N” criteria in the same column—is required to report a case.
*Serologic methods for diagnosis are currently being defined.
**Close contact is defined as being within 6 feet for a period of 10 minutes to 30 minutes or more depending upon the exposure. In
healthcare settings, this may be defined as exposures of greater than a few minutes or more. Data are insufficient to precisely define the
duration of exposure that constitutes prolonged exposure and thus a close contact.
Council of State and Territorial Epidemiologists
Technical Supplement: Interim-20-ID-01
Table VII. Classification Table: Criteria for defining a case of COVID-19.
Criterion Probable Confirmed
Clinical Evidence
At least two of the following symptoms: O O O
• Fever (measured or subjective)
• Chills
• Rigors
• Myalgia
• Headache
• Sore throat
• New olfactory and taste disorder(s)
At least one of the following symptoms: O O O
• Cough
• Shortness of breath
• Difficulty breathing
Clinical or radiographic evidence of pneumonia O O O
Acute respiratory distress syndrome (ARDS) O O O
No alternative more likely diagnosis N N N
Laboratory Evidence
Detection of SARS-CoV-2 RNA in a clinical specimen using a molecular S
amplification detection test that has been approved or authorized by the
FDA or designated authority
Detection of specific antigen in a clinical specimen using tests approved O O O
or authorized by the FDA or designated authority
Detection of specific antibody in serum, plasma, or whole blood O O O
indicative of a new or recent infection* using tests approved or
authorized by the FDA or designated authority
Absence of molecular amplification detection test for SARS-CoV-2 RNA N N
Epidemiologic Linkage Evidence
Close contact** with a confirmed or probable case of COVID-19 disease O O O
in the 14 days before onset of symptoms
Close contact** in the 14 days before onset of symptoms with a person O O O
with:
• clinically compatible illness AND
• linkage to a confirmed case of COVID-19 disease
Travel to an area with sustained, ongoing community transmission of O O O
SARS-CoV-2 in the 14 days prior to onset of symptoms
Residence in an area with sustained, ongoing community transmission O O O
of SARS-CoV-2 in the 14 days prior to onset of symptoms
Member of a risk cohort, as defined by public health authorities during O O O
an outbreak, in the 14 days prior to onset of symptoms
Vital Records Evidence
A death certificate that lists COVID-19 disease or SARS-CoV-2 as a N
cause of death or a significant condition contributing to death
Criteria to distinguish a new case:
N/A N/A N/A N/A N/A N/A N/A
Notes:
S = This criterion alone is SUFFICIENT to classify a case.
N = All “N” criteria in the same column are NECESSARY to classify a case. A number following an “N” indicates that this criterion is only required for a
specific disease/condition subtype (see below). If the absence of a criterion (i.e., criterion NOT present) is required for the case to meet the
classification criteria, list the absence of criterion as a necessary component.
O = At least one of these “O” (ONE OR MORE) criteria in each category (categories=clinical evidence, laboratory evidence, and epidemiologic
evidence) in the same column—in conjunction with all “N” criteria in the same column—is required to classify a case. A number following an “O”
indicates that this criterion is only required for a specific disease/condition subtype.
* Serologic methods for diagnosis are currently being defined.
**Close contact is defined as being within 6 feet for a period of 10 minutes to 30 minutes or more depending upon the exposure. In healthcare
settings, this may be defined as exposures of greater than a few minutes or more. Data are insufficient to precisely define the duration of exposure
that constitutes prolonged exposure and thus a close contact.
Council of State and Territorial Epidemiologists
Technical Supplement: Interim-20-ID-01
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