Related Experiment Video
Updated: Aug 7, 2025
Separation of Immune Cell Subpopulations in Peripheral Blood Samples from Children with Infectious Mononucleosis
Published on: September 7, 2022
Understanding COVID-19 in children: immune determinants and post-infection conditions
Gioacchino Andrea Rotulo1,2, Paolo Palma3,4
1Research Unit of Clinical Immunology and Vaccinology, Bambino Gesù Children's Hospital, IRCCS, 00165, Rome, Italy.
Insights
Children exhibit distinct immune responses to severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), often milder infections but with risks of post-infectious conditions like multisystem inflammatory syndrome in children (MIS-C). Age-related immune differences are key factors.
Area of Science:
- Pediatric Immunology
- Virology
- Infectious Diseases
Background:
- Coronavirus disease 2019 (COVID-19) in children typically presents with milder symptoms compared to adults.
- However, a subset of children develops post-infectious inflammatory conditions, notably multisystem inflammatory syndrome in children (MIS-C).
- Age-related variations in the immune system are hypothesized to underlie both protective mechanisms and susceptibility to severe outcomes or post-infectious syndromes.
Purpose of the Study:
- To review and synthesize current literature on the pediatric immune response to SARS-CoV-2.
- To analyze age-specific differences in innate and adaptive immunity related to SARS-CoV-2 infection in children.
- To explore the immunological underpinnings of post-infectious conditions, including MIS-C, in the pediatric population.
Main Methods:
- Systematic review of recent scientific literature focusing on pediatric SARS-CoV-2 immunology.
- Categorization of immune responses into innate and acquired immunity.
- Analysis of studies examining immune markers and altered immune responses in children with acute infection and post-infectious syndromes.
Main Results:
- Children mount a prompt innate immune response, including type I interferon production and neutralizing antibodies, crucial for infection control.
- Immune profiles in children, characterized by a higher proportion of naive and regulatory T cells, may contribute to avoiding cytokine storms.
- The precise mechanisms driving the intense inflammatory response in MIS-C require further investigation, highlighting a critical area of pediatric immunology.
Conclusions:
- Significant age-related differences exist in the pediatric immune response to SARS-CoV-2, influencing disease severity and post-infectious sequelae.
- Understanding these immune variations is crucial for identifying children at risk for severe outcomes and MIS-C.
- This review provides an overview of immune markers, age-related responses, post-infectious conditions, and current therapeutic strategies for pediatric COVID-19.
Abstract:
Coronavirus disease 2019 in children presents with milder clinical manifestations than in adults. On the other hand, the presence of a wide range of inflammatory manifestations, including multisystem inflammatory syndrome in children (MIS-C), in the period after infection suggests a particular susceptibility of some children toward severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). Both protective factors that prevent evolution to severe forms and risk factors for post-infectious conditions are likely to be found in age-related differences in the immune system. The prompt innate response with type I IFN production and the generation of neutralizing antibodies play a crucial role in containing the infection. The greater number of naive and regulatory cells in children helps to avoid the cytokine storm while the causes of the intense inflammatory response in MIS-C need to be elucidated. This review aims to analyze the main results of the recent literature assessing immune response to SARS-CoV-2 over the pediatric age group. We summarized such observations by dividing them into innate and acquired immunity, then reporting how altered immune responses can determine post-infectious conditions. IMPACT: The main immune markers of acute SARS-CoV-2 infection in children are summarized in this review. This paper reports a broad overview of age-related differences in the immune response to SARS-CoV-2 and emerging post-infection conditions. A summary of currently available therapies for the pediatric age group is provided.
More Related Videos
Related Concept Videos
01:26Factors Affecting the Risk of Infection
The integrity and count of the white blood cells help the body resist pathogens and fight infection. When impaired, it reduces the body's resistance to pathogens. The acidic pH levels of the gastrointestinal, genitourinary tracts, and skin...
01:25Immunodeficiency Diseases
There are three main causes of immunodeficiency...
01:29Immune Response Against Viral Pathogens
NK Cells
NK cells are a crucial part of our innate immune system, acting as the first line of defense against viral infections. These cells can recognize and kill infected cells without prior exposure to the virus, effectively slowing down the spread of infection. Additionally, NK cells produce proinflammatory...
01:22Development of Immunocompetence
The initial cells that migrate from the fetal thymus settle within the skin and epithelial tissues lining the mouth, digestive tract, and in females, the uterus and vagina. These cells, including skin-based dendritic cells, serve as antigen-presenting cells, playing a key role in T cell activation.
Subsequent T...
01:23Immunological Memory
What is Immunological Memory?
Immunological memory is an integral function of the immune system that allows it to recognize and react more rapidly and effectively to pathogens previously encountered. This feature...
01:27Cytotoxic T Cells-mediated Immune Response
Immunological surveillance is the ability of immune cells to monitor and eliminate infected cells with intracellular pathogens, neoplastically transformed cells, and cells with non-self antigens. Cytotoxic T cells and NK...