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Viruses in asthma.

Simon D Message1, Sebastian L Johnston

  • 1Department of Respiratory Medicine, National Heart and Lung Institute, London, UK.

British Medical Bulletin
|May 9, 2002
PubMed
Summary

Early-life exposure to infectious agents, like respiratory viruses, helps mature the immune system, potentially preventing atopic diseases. Understanding these infections is key to developing new asthma treatments.

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Area of Science:

  • Immunology
  • Infectious Diseases
  • Allergy and Asthma Research

Background:

  • The 'hygiene hypothesis' suggests reduced early-life infections in industrialized nations contribute to increased asthma and atopy.
  • Exposure to infectious agents, particularly respiratory viruses, influences immune system development from a type 2 to a type 1 response.
  • Respiratory viral infections are significant triggers for infant wheezing and childhood asthma exacerbations.

Purpose of the Study:

  • To explore the role of early-life infectious agent exposure in immune system maturation and the prevention of atopic diseases.
  • To investigate the specific protective or detrimental effects of different childhood infections.
  • To understand the immunopathogenesis of virus-induced asthma for developing novel therapeutic strategies.

Main Methods:

  • Review of current evidence on the impact of early-life infections on immune development.
  • Analysis of the role of respiratory viruses in infant wheezing and childhood asthma.
  • Examination of the immunopathogenetic mechanisms underlying virus-induced asthma.

Main Results:

  • Early-life exposure to a high load of infectious agents promotes immune maturation, potentially preventing atopic diseases.
  • Respiratory viruses are implicated in up to 85% of wheezing and asthma exacerbation episodes.
  • Rhinovirus and respiratory syncytial virus (RSV) are key respiratory viruses in different age groups.

Conclusions:

  • Modulating early-life immune responses through controlled exposure to beneficial infectious agents could offer a strategy to prevent atopy.
  • Further research into the immunopathogenesis of virus-induced asthma is crucial for developing targeted treatments.
  • Understanding the balance between beneficial and harmful infections is essential for public health strategies.

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