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Post‑COVID‑19 syndrome in children (Review)
Filippos Filippatos1, Elizabeth-Barbara Tatsi2, Athanasios Michos1
1First Department of Pediatrics, Infectious Diseases and Chemotherapy Research Laboratory, Medical School, National and Kapodistrian University of Athens, 'Aghia Sophia' Children's Hospital, 11527 Athens, Greece.
Insights
Post-COVID syndrome (PCS) in children remains unclear, with varying symptom prevalence. Further research is needed to understand risk factors and immune system roles in pediatric long COVID.
Area of Science:
- Pediatric infectious diseases
- Immunology
- Public health
Background:
- Post-COVID syndrome (PCS) describes persistent symptoms after SARS-CoV-2 infection.
- Long-term clinical outcomes in children post-SARS-CoV-2 infection require further investigation.
- Evidence suggests a lower prevalence of PCS in children compared to adults, but study heterogeneity complicates incidence estimation.
Purpose of the Study:
- To review and describe long-term symptoms of PCS in children across biological systems.
- To identify potential risk factors associated with PCS in pediatric populations.
- To explore the role of the immune system in the development and course of PCS in children.
Main Methods:
- Systematic literature review of studies on post-COVID syndrome in children.
- Analysis of reported long-term symptoms categorized by biological system.
- Examination of proposed pathophysiological mechanisms and risk factors.
Main Results:
- Heterogeneity in current studies makes precise PCS incidence in children difficult to ascertain.
- Risk factors and recovery patterns differ between adult and pediatric PCS.
- Potential mechanisms include age-dependent immune responses, ACE2 expression, and social factors.
Conclusions:
- The exact incidence and clinical spectrum of PCS in children are not well-defined.
- Age-specific immune responses and other factors may influence PCS development in children.
- Longitudinal studies are essential to clarify the pathophysiology and long-term outcomes of PCS in pediatric populations.
Abstract:
The persistence of symptoms for a long time after severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infection is now familiar as post-COVID syndrome (PCS). To the best of our knowledge, the risk of long-term clinical outcomes in children after SARS-CoV-2 infection is still unclear. Unlike in adults, current evidence suggests a lower prevalence of persistent symptoms in children. However, since several studies are characterized by great heterogeneity, it is difficult to accurately estimate the exact incidence of PCS in children. The presence and course of recovery depend on risk factors that are more common in adults than children. Proposed pathophysiological mechanisms in PCS in children include age-dependent immune responses, angiotensin-converting enzyme 2 expression, blood-brain barrier development or social issues affecting children behavior, such as school closure and social isolation. However, further longitudinal studies are required for unanswered issues to be clarified. The aim of the present review is to describe the long-term symptoms per biological system in children, potential risk factors and the role of the immune system in the presence of PCS.
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