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An In vitro Model to Study Immune Responses of Human Peripheral Blood Mononuclear Cells to Human Respiratory Syncytial Virus Infection
Published on: December 10, 2013
Viral infectivity in pediatric SARS-CoV-2 clinical samples does not vary by age
Madaline M Schmidt1, Hannah W Despres1, David J Shirley2
1Department of Microbiology and Molecular Genetics, Robert Larner, M.D. College of Medicine, University of Vermont, Burlington VT, 05405, USA.
Insights
Children infected with SARS-CoV-2 generally experience mild illness, even with new variants. Unique virologic factors in children may explain their lower symptom severity and reduced transmission early in the pandemic.
Area of Science:
- Pediatric Infectious Diseases
- Virology
- Epidemiology
Background:
- Early in the SARS-CoV-2 pandemic, the role of children in transmission was unclear.
- Children were found to be susceptible to SARS-CoV-2 but typically had milder symptoms and lower severe disease incidence compared to adults.
- This pattern persisted with variants like Delta and Omicron, even in unvaccinated children under 5.
Approach:
- Investigate the virologic characteristics of SARS-CoV-2 in children.
- Compare viral kinetics and infectivity in pediatric versus adult populations.
- Hypothesize unique virologic features in children contributing to reduced symptom severity and transmissibility.
Key Points:
- Children are susceptible to SARS-CoV-2 infection.
- The majority of pediatric infections result in mild symptoms.
- Severe disease incidence is lower in children compared to adults, irrespective of variants or vaccination status.
- Unique virologic features in children are hypothesized to influence symptom presentation and transmission dynamics.
Conclusions:
- Children exhibit distinct SARS-CoV-2 infection patterns compared to adults.
- Further research into pediatric virology is needed to understand the mechanisms behind milder disease and potentially lower infectivity.
- Understanding these differences is crucial for public health strategies and managing pediatric infectious diseases.
Abstract:
During the early months of the SARS-CoV-2 pandemic, notable uncertainty emerged regarding the role of children in transmission dynamics. With time, it became more clear that children were susceptible to infection with SARS-CoV-2, but that the vast majority of children experienced mild symptoms with lower incidence of severe disease. This pattern remained consistent despite the later emergence of SARS-CoV-2 variants, including Delta and Omicron, even among children <5 ineligible for vaccination. The relative lack of severe disease in the pediatric population raised questions regarding viral kinetics and infectivity in children versus adults. We hypothesized that unique virologic features in children could explain this apparent decrease in symptoms and transmissibility early in the pandemic.
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