The Council of State and Territorial Epidemiologists (CSTE) and CDC have developed a new CSTE/CDC MIS-C surveillance case definition, corresponding case report form and case report form guidance document to be used starting January 1, 2023. MIS-C cases with illness onset before January 1, 2023, but reported after January 1, 2023, will be assigned using the 2020 CDC MIS-C case definition but reported using the new case report form. An interim case reporting guidance document will be provided for these cases.

Overview

Multisystem Inflammatory Syndrome in Children (MIS-C) Associated with Coronavirus Disease 2019 (COVID-19)
PURPOSE

This document aims to ensure that clinicians are aware of current guidance regarding Multisystem Inflammatory Syndrome in Children (MIS-C) Associated with Coronavirus Disease 2019 (COVID-19), including the case definition and guidance on reporting to local health departments.

BACKGROUND
 
  • Clinicians in the United Kingdom, New York City and New York State have reported cases of children with multisystem inflammatory syndrome (many of whom tested positive for SARSCoV-2 infection by RT-PCR or serologic assay). Additional reports of children presenting with severe inflammatory syndrome with a laboratory-confirmed case of COVID-19 or an epidemiological link to a COVID-19 case have been reported by authorities in other countries.
  • On May 14, 2020, the Centers for Disease Control (CDC) issued a Health Advisory regarding a multisystem inflammatory syndrome in children (MIS-C) associated with coronavirus disease 2019 (COVID-19), along with a case definition for this syndrome.
  • There is limited information currently available regarding the risk factors, pathogenesis, clinical course, and treatment for MIS-C.

ESSENTIAL ACTIONS
 
  • All health care providers should maintain a high index of suspicion for MIS-C.
  • Suspected cases of MIS-C should be referred immediately to a tertiary care center with a pediatric intensive care unit (PICU).
  • Tertiary care centers are asked to consider a collaborative approach in the management of these patients by convening a multispecialty committee (comprised of pediatric critical care, cardiology, hematology, infectious disease, and rheumatology/immunology) that provides coordinated clinical care guidance for each patient while (1) confirming patients meet the case definition, and (2) ensuring that appropriate diagnostic and treatment resources are readily available for this patient population.
  • Hospital infection preventionists should be notified immediately upon recognition of patients meeting case definition to initiate public health reporting.

TESTING
 
  • In suspected cases of MIS-C, strongly recommend the following additional laboratory testing due to the potential for myocardial involvement: BNP and Troponin.
  • If the BNP and/or Troponin levels are elevated, initiate transfer to a tertiary care center with a PICU.
  • Hospitals must assess for current or recent SARS-COV-2 infection by performing a combination of RT-PCR, antigen test and/or serology (as available) in patients who are under 21 years of age and present with symptoms compatible with MIS-C associated with COVID-19.

Latest Data

Epidemiological Trends As Of December 31, 2022

TOTAL MIS-C CASES MEETING CASE DEFINITION
97
TOTAL MIS-C DEATHS MEETING CASE DEFINITION
0

Monthly Chicago MIS-C cases and COVID-19 cases, March 2020 through December 2022

Note: COVID-19 cases were counted based on specimen collection date. MIS-C cases were counted based on MIS-C illness onset date, fever onset date if illness onset date was unknown, or hospital admission date if both fever and illness onset dates were unknown.

 
Characteristics of Reported MIS-C Patients

MIS-C Patients by Age Group
 
MIS-C Patients by Sex
  N %
Male 63 65%
Female 34 35%
MIS-C Patients by Race & Ethnicity
  N %
Black, non-Latinx 51 53%
Latinx 34 35%
White, non-Latinx 8 8%
Native Hawaiian, Other Pacific Islander 1 1%
Unknown 3 3%
Indicators of Illness Severity
  N %
ICU admission 71 73%
Non-invasive ventilation 6 6%
Mechanical ventilation 11 11%
Received vasoactive medications 50 52%
Vaccination Status*
    N %
Unvaccinated status Eligible for vaccine at time of illness 26 27%
Unvaccinated status Not eligible for vaccine at time of illness 66 68%
Vaccinated status Partially vaccinated 1 1%
Vaccinated status Fully vaccinated, not boosted 3 3%
  Boosted 1 1%
*Status reflects vaccination history at time of illness onset.

Partially vaccinated means a person has received only one dose of a two-dose COVID-19 vaccine primary series.

Fully vaccinated, not boosted means a person has received all recommended doses in their primary series of COVID-19 vaccine but has not received a booster dose of vaccine.

Boosted means a person is fully vaccinated and has received a booster dose of COVID-19 vaccine.

For current COVID-19 vaccination recommendations and schedule see: https://www.cdc.gov/vaccines/covid-19/clinical-considerations/interim-considerations-us.html#recommendations

 

How to Report Suspect Cases of MIS-C

1

Case Report Form: Fill the case report form as completely as possible, scan and upload  the form to CDPH  using the following REDCap Project: https://redcap.link/misc_afm. REDCap is a secure platform to share documents with CDPH. For instructions on filling out the case report form, please review this guidance document.  MIS-C cases with illness onset before January 1, 2023, but reported after January 1, 2023, will be assigned using the 2020 CDC MIS-C case definition but reported using the new case report form. An interim case reporting guidance document can be helpful for these cases. If you need support filling out the form, please email maria.joseph@cityofchicago.org and indicate a point of contact and direct phone number for our investigators to reach you to obtain appropriate medical records to submit the form to CDC. Ideally, the case report form includes information on patient discharge but notification of the suspect case should occur right away.

2

I-NEDSS entry: Enter suspect MIS-C cases into the COVID-19 I-NEDSS module “Multisystem Inflammatory Syndrome”.  There does not have to be a positive COVID test in order to enter into the module.  It can be an epi link, COVID-like illness, or a positive molecular, antigen, or antibody test.  If your lab or a commercial send out lab does not have the ability to run serologic testing, consider drawing serum and saving it prior to any treatments.

Case Definition

CDC Case Definition for Multisystem Inflammatory Syndrome in Children (MIS-C)

Any illness in a person aged less than 21 years that meets:
  • The clinical AND the laboratory criteria (Confirmed), OR
  • The clinical criteria AND epidemiologic linkage criteria (Probable), OR
  • The vital records criteria (Suspect)
Clinical Criteria
An illness characterized by all of the following, in the absence of a more likely alternative diagnosis*
  • Subjective or documented fever (temperature ≥38.0⁰ C)
  • Clinical severity requiring hospitalization or resulting in death
  • Evidence of systemic inflammation indicated by C-reactive protein ≥3.0 mg/dL (30 mg/L)
  •  New onset manifestations in at least two of the following categories:  
  1. Cardiac involvement indicated by:
    • Left ventricular ejection fraction <55% OR
    • Coronary artery dilatation, aneurysm, or ectasia, OR
    • Troponin elevated above laboratory normal range, or indicated as elevated in a clinical note
  2. Mucocutaneous involvement indicated by:
    • Rash, OR
    • Inflammation of the oral mucosa (e.g., mucosal erythema or swelling, drying or fissuring of the lips, strawberry tongue), OR 
    • Conjunctivitis or conjunctival injection (redness of the eyes), OR
    • Extremity findings (e.g., erythema [redness] or edema [swelling] of the hands or feet)
  3. Shock**
  4. Gastrointestinal involvement indicated by:
    • Abdominal pain, OR
    • Vomiting, OR
    • Diarrhea
  5. Hematologic involvement indicated by:
    • Platelet count <150,000 cells/μL, OR
    • Absolute lymphocyte count (ALC) <1,000 cells/μL
Laboratory Criteria for SARS-CoV-2 Infection
  • Detection of SARS-CoV-2 RNA in a clinical specimen*** up to 60 days prior to or during hospitalization, or in a post-mortem specimen using a diagnostic molecular amplification test (e.g., polymerase chain reaction [PCR]), OR
  • Detection of SARS-CoV-2 specific antigen in a clinical specimen*** up to 60 days prior to or during hospitalization, or in a post-mortem specimen, OR
  •  Detection of SARS-CoV-2 specific antibodies^ in serum, plasma, or whole blood associated with current illness resulting in or during hospitalization
Epidemiologic Linkage Criteria
Close contact‡ with a confirmed or probable case of COVID-19 disease in the 60 days prior to hospitalization

Vital Records Criteria
  • A person whose death certificate lists MIS-C or multisystem inflammatory syndrome as an underlying cause of death or a significant condition contributing to death
*If documented by the clinical treatment team, a final diagnosis of Kawasaki Disease should be considered an alternative diagnosis. These cases should not be reported to national MIS-C surveillance.
** Clinician documentation of shock meets this criterion.
***Positive molecular or antigen results from self-administered testing using over-the-counter test kits meet laboratory criteria.
^Includes a positive serology test regardless of COVID-19 vaccination status. Detection of anti-nucleocapsid antibody is indicative of SARS-CoV-2 infection, while anti-spike protein antibody may be induced either by COVID-19 vaccination or by SARS-CoV-2 infection.
‡Close contact is generally defined as being within 6 feet for at least 15 minutes (cumulative over a 24-hour period). However, it depends on the exposure level and setting; for example, in the setting of an aerosol-generating procedure in healthcare settings without proper personal protective equipment (PPE), this may be defined as any duration.

MIS-C Reporting

For Clinical Questions Or To Report Suspect Cases, Contact:

The CDPH Disease Reporting Hotline at 312-743-9000
 

*After hours, weekends, and holidays, please call 311 and ask for the communicable disease physician on-call (or call 312-744-5000 if outside the City of Chicago)

MIS-C ANNUAL REPORT

April 2020-June 2021

Report Available Here

MIS-C Omicron Poster

Change in Incidence of MIS-C Across the COVID-19 Pandemic in Chicago - March 2020-July 2022

Omicron Poster Information

Asset Publisher

Healthcare Provider Resources

Handouts for Parents Source: The Center for Disease Control and Prevention