Related Experiment Video
Updated: Aug 18, 2026
Murine Model of Allergen Induced Asthma
Published on: May 14, 2012
House dust mite control measures for asthma
P C Gøtzsche1, H K Johansen, M L Burr
1The Nordic Cochrane Centre, Rigshospitalet, Blegdamsvej 9, Copenhagen Ø, Denmark, 2100. p.c.gotzsche@cochrane.dk
Background:
The major allergen in house dust comes from mites. Chemical, physical and combined methods of reducing mite allergen levels are intended to reduce asthma symptoms in people who are sensitive to house dust mites.
Objectives:
The objective of this review is to assess the effects of reducing exposure to house dust mite antigens in the homes of mite-sensitive asthmatics, assessing chemical and physical methods separately and together.
Search Strategy:
We searched the Cochrane Airways Group trials register, checked reference lists of articles and hand-searched Respiration (1980 to 1996) and Clinical and Experimental Allergy (1980 to 1996). The Cochrane Library is searched every three months.
Selection Criteria:
Randomised trials of mite control measures vs placebo or no treatment in asthmatic people known to be sensitive to house dust mites.
Data Collection And Analysis:
Two reviewers applied the trial inclusion criteria, assessed their quality and extracted the data independently. Study authors were contacted to clarify information.
Main Results:
Twenty-nine trials (939 patients in the analyses) were included, with two trials awaiting assessment. Nine trials assessed chemical methods alone, 15 physical methods alone, and 5 a combination of chemical and physical methods. Overall, there was no statistically significant difference improvement of asthma (relative risk 1.04, 95% confidence interval 0.83 to 1.31), asthma symptom scores (standardised mean difference -0.07, 95% confidence interval -0.35 to 0.22), medication usage (standardised mean difference -0.14, 95% confidence interval -0.43 to 0.15), or peak flow in the morning (standardised mean difference 0.04, 95% confidence interval -0.13 to 0.21). For chemical methods used alone, there was a statistically significantly adverse effect on symptoms (P = 0.03), whereas for physical methods used alone as evaluated in parallel group trials, there was a statistically significant beneficial effect (P = 0.02). However, because of the large number of significance tests we performed, two significant results would be expected to occur by chance.
Reviewer'S Conclusions:
Currently available evidence from controlled trials of chemical and physical approaches to reducing exposure to house dust mite antigens in the homes of mite-sensitive asthmatics does not provide a secure basis for advice and policy. Further trials - one of them very large - are currently in progress. The additional evidence from these studies will help to clarify whether or not the substantial efforts required to implement strategies intended to reduce mites can be expected to yield beneficial effects of a magnitude that people with mite sensitive asthma consider worthwhile.
Insights
Reducing house dust mite exposure through chemical or physical methods shows no significant overall improvement for asthma symptoms. While physical methods alone had a beneficial effect, chemical methods alone worsened symptoms, indicating a need for further research.
Area of Science:
- Allergy and Immunology
- Environmental Health
- Respiratory Medicine
Background:
- House dust mites are a primary source of allergens contributing to asthma.
- Interventions aim to reduce mite allergen exposure to alleviate asthma symptoms in sensitive individuals.
Purpose of the Study:
- To evaluate the efficacy of chemical and physical methods in reducing house dust mite allergen exposure.
- To assess the impact of these interventions on asthma symptoms, medication use, and lung function in mite-sensitive asthmatics.
Main Methods:
- Systematic review of randomized controlled trials (RCTs).
- Searched multiple databases including the Cochrane Airways Group trials register.
- Included RCTs comparing mite control measures against placebo or no treatment in mite-sensitive asthmatics.
Main Results:
- Twenty-nine trials involving 939 patients were analyzed.
- No significant overall improvement in asthma control, symptom scores, medication use, or peak flow was observed.
- Chemical methods alone showed a statistically significant adverse effect on symptoms (P=0.03), while physical methods alone showed a significant benefit (P=0.02).
Conclusions:
- Current evidence does not strongly support chemical or physical methods for reducing house dust mite exposure in asthma management.
- Further large-scale trials are ongoing to clarify the benefits of mite reduction strategies.
- The substantial effort required for mite control needs to be weighed against potentially modest benefits for individuals with mite-sensitive asthma.
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