Related Experiment Videos
Inverse social gradient of secondary immune response parameters in children
1GSF National Research Center for Environment and Health, Institute of Epidemiology, Neuherberg, Germany. bolte@gsf.de
Insights
Children from lower social classes experience more frequent infections, which may boost their secondary immune response and protect against severe respiratory illnesses. This highlights health inequalities in pediatric immune responses and infection prevalence related to socioeconomic status.
Area of Science:
- Pediatric immunology
- Social epidemiology
- Respiratory health
Background:
- Allergy prevalence in children correlates with socioeconomic status.
- Frequent immune stimulation from infections may prevent allergic disease development.
- A social gradient in childhood infections is expected if infections confer protection.
Purpose of the Study:
- To investigate the relationship between social class, immune parameters, and respiratory infection prevalence in children.
- To assess how socioeconomic factors influence immune system development and susceptibility to infections.
- To understand the role of infections in mediating health inequalities in children.
Main Methods:
- Cross-sectional survey of 1724 children aged 5-14 years in Germany.
- Data collected via parent questionnaires and blood sample analyses.
- Social class determined by parental education; immune parameters (IgG, IgA, IgM, C3c, leukocytes) analyzed; respiratory infection prevalence assessed.
Main Results:
- Inverse association found between social class and secondary immune response (IgG, IgA).
- Primary immune reactions and inflammation markers (IgM, C3c, leukocytes) showed no social class relation.
- An inverse social gradient in febrile colds was observed, while bronchitis, tonsillitis, and otitis media decreased with lower social class.
Conclusions:
- Health disparities in immune responses and respiratory infections exist among children of different social classes.
- Hypothesized that increased infections in lower social classes stimulate the secondary immune response.
- This stimulation may offer protection against more severe respiratory infection outcomes in disadvantaged children.
Background:
In children, the prevalence of allergy increases with increasing socioeconomic status. If frequent immune response stimulation by infections protects against development of allergic diseases, then a social gradient in infections should exist. The aim of our study was to assess the relation between social class, immune parameters, and the prevalence of respiratory infections in children.
Methods:
A cross-sectional survey examined children aged 5 to 14 years in 3 communities of Sachsen-Anhalt, Germany. Data of 1724 children were gathered by a parent-completed questionnaire and analyses of blood samples. Social class was defined by parental educational level. Immune parameters included serum immunoglobulin (Ig)G, IgA, and IgM; the C3c component of complement; and the total leukocyte count. The period prevalence of febrile colds and lifetime prevalences of physician-diagnosed bronchitis, tonsillitis, otitis media, and pneumonia were assessed from parents' reports. Adjusted odds ratios for the association between social class and belonging to the group of children with immune parameter levels in the upper 50th or 75th percentile or experiencing respiratory infections were calculated by logistic regression.
Results:
Social class was inversely associated with secondary immune response parameters (IgG, IgA), whereas indicators of primary immune reactions and inflammation (IgM, C3c, leukocytes) were not related to social status. While an inverse social gradient was found for the period prevalence of febrile colds, the frequency of bronchitis, tonsillitis, and otitis media decreased with decreasing social class.
Conclusions:
Health inequalities exist in immune reactions and respiratory infections in children from different social classes. We hypothesize that in children from lower social classes, increased frequency of infections stimulated the secondary immune response and protected against more severe courses of respiratory infections.