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Changes in indoor allergen and fungal levels predict changes in asthma activity among young adults

M C Matheson1, M J Abramson, S C Dharmage

  • 1Department of Epidemiology and Preventive Medicine, Central and Eastern Clinical School, Monash University, Melbourne, Australia. Melanie.Matheson@med.monash.edu.au

Clinical and Experimental Allergy : Journal of the British Society for Allergy and Clinical Immunology
|July 13, 2005
PubMed
Abstract

Insights

Increased indoor fungi and dust mite exposure are linked to higher asthma and atopy risks in adults. Changes in these allergen levels significantly impact asthma development and persistence.

Area of Science:

  • Environmental Health
  • Allergy and Immunology
  • Respiratory Medicine

Background:

  • Allergen exposure is a significant risk factor for asthma development.
  • Indoor environmental quality plays a crucial role in respiratory health.

Purpose of the Study:

  • To investigate the impact of longitudinal changes in indoor allergen and fungal exposures on asthma and related outcomes.
  • To examine the association between environmental allergen levels and clinical asthma indicators.

Main Methods:

  • A longitudinal study involving home visits and sample collection (dust, air) over two years.
  • Assays for specific allergens (Der p 1, Fel d 1) and fungal markers (ergosterol).
  • Clinical assessments including questionnaires, spirometry, methacholine challenge, and skin prick testing.

Main Results:

  • Doubling of fungal exposure correlated with a 52% increase in asthma attacks and a 53% increase in developing atopy.
  • Increased Fel d 1 levels were associated with a 73% higher odds of doctor-diagnosed asthma.
  • Elevated Der p 1 levels in bed dust linked to a 64% greater odds of persistent bronchial hyper-reactivity.

Conclusions:

  • Changes in indoor fungal and house dust mite levels influence the risk of adult asthma and atopy.
  • Further research is needed to confirm the benefits of reducing indoor allergen exposure and elucidate underlying mechanisms.

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