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SARS-CoV-2 Infection in Children: Revisiting Host-Virus Interactions Through Post-Infection Immune Profiling.

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Pediatric COVID-19 immune responses vary by age and severity. Younger children and severe cases show weaker antibody and cellular immunity, impacting management and vaccine strategies.

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Area of Science:

  • Immunology
  • Virology
  • Pediatrics

Background:

  • COVID-19 in children often presents with milder symptoms but severe cases occur.
  • Understanding age-related immune responses to SARS-CoV-2 is vital for pandemic preparedness.
  • Immune dynamics in pediatric SARS-CoV-2 infection require detailed characterization across different time points.

Purpose of the Study:

  • To characterize the dynamics of immune responses to SARS-CoV-2 in pediatric patients.
  • To investigate age-, gender-, and disease severity-dependent variations in pediatric immune responses.
  • To inform improved patient management and age-adjusted immunization strategies for COVID-19.

Main Methods:

  • Analysis of 145 samples from 119 pediatric patients (<18 years) with confirmed SARS-CoV-2 infection.
  • Assessment of immune markers at four distinct time points: <14 days, 14 days-3 months, 3-6 months, and 6-12 months post-infection.
  • Characterization of T-cell activation, exhaustion (PD-1+), B-cell subsets (memory, antibody-secreting cells - ASCs), and antibody titers.

Main Results:

  • Pediatric patients showed increased activated T-cells, exhaustion markers, ASCs, and decreased unswitched memory B-cells at infection.
  • Both humoral and cellular anti-SARS-CoV-2 responses increased over time, with measurable responses in all patients at 6-12 months.
  • Asymptomatic/mild cases had enhanced cellular responses and memory B-cells, while severe cases were younger, predominantly male, with altered T/B-cell ratios and reduced PHA responses.
  • Younger children exhibited lower antibody titers and weaker cellular responses compared to adolescents, correlating with higher severe disease prevalence.

Conclusions:

  • Immune responses to SARS-CoV-2 in children exhibit significant variations based on age, gender, and disease severity.
  • Distinct immune profiles in asymptomatic/mild versus severe pediatric COVID-19 cases were identified.
  • Findings support the need for tailored patient management and age-specific immunization strategies for pediatric COVID-19.