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Severe pediatric COVID-19: a review from the clinical and immunopathophysiological perspectives
Yi-Kan Sun1,2, Can Wang3, Pei-Quan Lin3
1Children's Hospital, Zhejiang University School of Medicine, Hangzhou, 310052, China.
Insights
Severe COVID-19 in children, though rare, can be fatal and impacts multiple organs. Understanding the complex immune response in pediatric patients is crucial for developing effective treatments and guidelines.
Area of Science:
- Pediatric immunology
- Infectious diseases
- Critical care medicine
Background:
- Coronavirus disease 2019 (COVID-19) typically presents mildly in children, but severe and critical cases occur, necessitating clinical attention.
- The pathophysiology of severe pediatric COVID-19 involves complex interactions between pathogen virulence and host defense mechanisms, which are not fully understood.
Purpose of the Study:
- To review the current understanding of severe COVID-19 in children.
- To highlight the immunological aspects and clinical manifestations of severe pediatric COVID-19.
- To identify gaps in pediatric-specific research and guidelines.
Main Methods:
- A comprehensive literature review was performed using PubMed, Embase, and Wanfang databases.
- Keywords included "COVID-19 in children", "severe pediatric COVID-19", and "critical illness in children with COVID-19".
Main Results:
- Severe COVID-19 risk in children increases with comorbidities and unvaccinated status.
- Pulmonary, cardiovascular, and neurological complications are observed, alongside immune dysregulation (e.g., interferon and inflammasome pathways).
- Multisystem inflammatory syndrome in children (MIS-C) is a complex immune-mediated condition associated with COVID-19.
Conclusions:
- Severe pediatric COVID-19 affects multiple organ systems, driven by dysregulated immune pathways.
- The pediatric immune system's functional diversity and immunophenotypic differences from adults are evident in severe disease.
- Pediatric-specific clinical guidelines are lacking and further research is warranted.
Background:
Coronavirus disease 2019 (COVID-19) tends to have mild presentations in children. However, severe and critical cases do arise in the pediatric population with debilitating systemic impacts and can be fatal at times, meriting further attention from clinicians. Meanwhile, the intricate interactions between the pathogen virulence factors and host defense mechanisms are believed to play indispensable roles in severe COVID-19 pathophysiology but remain incompletely understood.
Data Sources:
A comprehensive literature review was conducted for pertinent publications by reviewers independently using the PubMed, Embase, and Wanfang databases. Searched keywords included "COVID-19 in children", "severe pediatric COVID-19", and "critical illness in children with COVID-19".
Results:
Risks of developing severe COVID-19 in children escalate with increasing numbers of co-morbidities and an unvaccinated status. Acute respiratory distress stress and necrotizing pneumonia are prominent pulmonary manifestations, while various forms of cardiovascular and neurological involvement may also be seen. Multiple immunological processes are implicated in the host response to COVID-19 including the type I interferon and inflammasome pathways, whose dysregulation in severe and critical diseases translates into adverse clinical manifestations. Multisystem inflammatory syndrome in children (MIS-C), a potentially life-threatening immune-mediated condition chronologically associated with COVID-19 exposure, denotes another scientific and clinical conundrum that exemplifies the complexity of pediatric immunity. Despite the considerable dissimilarities between the pediatric and adult immune systems, clinical trials dedicated to children are lacking and current management recommendations are largely adapted from adult guidelines.
Conclusions:
Severe pediatric COVID-19 can affect multiple organ systems. The dysregulated immune pathways in severe COVID-19 shape the disease course, epitomize the vast functional diversity of the pediatric immune system and highlight the immunophenotypical differences between children and adults. Consequently, further research may be warranted to adequately address them in pediatric-specific clinical practice guidelines.
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