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Halting the allergic march
Hugo P Van Bever1, Sudesh T Samuel, Bee Wah Lee
1From the Department of Pediatrics, National University Singapore, Singapore.
Insights
Childhood allergic diseases like asthma are rising globally. Research suggests reduced early-life bacterial exposure may contribute, alongside genetics and environment, to these conditions.
Area of Science:
- Allergy and immunology
- Pediatric health
- Environmental medicine
Background:
- Childhood allergic diseases (asthma, rhinitis, atopic dermatitis) show a significant global increase.
- In Singapore, asthma prevalence exceeds 20%, with 50% of children exhibiting allergy indicators.
- Reduced early-life bacterial exposure is a potential factor in rising allergy rates, interacting with genetic and environmental influences.
Purpose of the Study:
- To review current understanding of allergic sensitization, from prenatal to postnatal stages.
- To explore the mechanisms behind the "allergic march" phenomenon.
- To discuss prevention and treatment strategies for allergic diseases.
Main Methods:
- Literature review of allergic sensitization.
- Analysis of "allergic march" mechanisms.
- Review of therapeutic interventions, including probiotics and immunotherapy.
Main Results:
- Allergic sensitization occurs both prenatally and postnatally.
- The "allergic march" involves a progression of allergic conditions.
- Bacterial products (probiotics, prebiotics, synbiotics) and immunotherapy show potential in managing allergies.
Conclusions:
- Allergic disease development is multifactorial, involving genetics and environment.
- Understanding allergic sensitization and the "allergic march" is crucial for management.
- Probiotics, prebiotics, synbiotics, and immunotherapy offer promising avenues for prevention and treatment.
Abstract:
The prevalence of childhood allergic diseases, such as allergic asthma, allergic rhinitis, and atopic dermatitis, has increased exponentially. In Singapore, the prevalence of asthma at all ages exceeds 20%, and around 50% of Singaporean children show features of an underlying allergy. The exact environmental causes for the increase of allergic diseases have not yet been identified, but most researchers agree that a decreased bacterial load in young children may be one of the reasons for the increase. However, the causes of allergy are multiple, and the development of an allergic disease is the result of complex interactions between genetic constitution and environmental factors. In this review article, different aspects of allergic sensitization are covered, including prenatal and postnatal sensitization. The phenomenon of the "allergic march" (switching from one clinical expression of allergy to another) and its underlying mechanisms are discussed. The last part of this review article is on prevention and treatment of allergic diseases, including the role of bacterial products (probiotics, prebiotics, and synbiotics) and the role of immunotherapy, including sublingual immunotherapy.
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