An unprecedented cluster of eight children with hyperinflammatory shock, showing features similar to atypical Kawasaki disease, Kawasaki disease shock syndrome were observed in South Thames Retrieval Service in London, UK. 

Michigan State University

For the patients between 3-13 month: 8 patients (80%) had fever, 6(60%) had cough, 4 (40%) had sore throat, 3 (30%) had stuffy nose, and 2(20%) had sneezing and rhinorrhea. None of the patients had diarrhea or dyspnea during the course of illness.
Fever resolved 24 h after fever onset with the peak of fever ranging from 37.7 °C to 39.2 °C.

Children's Symptomatic COVID-19 Infection

MIS-C "is a condition where different body parts can become inflamed, including the heart, lungs, kidneys, brain, skin, eyes, or gastrointestinal organs. This rampant inflammation has been recorded in multiple organ systems; yet, clinical research into the pathogenesis of the disease is insufficient. However, we know that many children with MIS-C were exposed or infected with SARS-CoV-2. Currently, the lack of a universal case definition of MIS-C has limited the number of cases that are accurately diagnosed and hampered with proper treatment of the disease. Further research into the clinical, epidemiological and immunological nature of MIS-C is desperately needed. MIS-C can be serious, even deadly, but most children who were diagnosed with this condition have gotten better with medical care."

Multisystem Inflammatory Syndrome in Children (MIS-C) associated with COVID-19

"Combined data from both PCR instruments show that viral loads of at least 250,000 copies, a threshold we previously established for the isolation of infectious virus in cell culture at more than 5% probability, were present across the study period in 29.0% of kindergarten-aged patients 0-6 years old (n=38), 37.3% of those aged 0-19 (n=150), and in 51.4% of those aged 20 and above (n=3153). The differences in these fractions may also be due to differences in test utilization. We conclude that a considerable percentage of infected people in all age groups, including those who are pre- or mild-symptomatic, carry viral loads likely to represent infectivity. Based on these results and
uncertainty about the remaining incidence, we recommend caution and careful monitoring during gradual lifting of non-pharmaceutical interventions. In particular, there is little evidence from the present study to support suggestions that children may not be as infectious as adults."

Abstract for An analysis of SARS-CoV-2 viral load by patient age

- Working Papers
- Journal of American Medical Association (JAMA)

References for Children's Symptomatic COVID-19 Infection by Journal/Source

This cross-sectional study included children positive for COVID-19 admitted to 46 North American PICUs between March 14 and April 3, 2020 with follow-up to April 10, 2020. The main outcomes and measures analyzed were prehospital characteristics, clinical trajectory, and hospital outcomes of children admitted to PICUs with confirmed COVID-19 infection.

Prehospital comorbidities appear to be an important factor in children. 

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