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Decay of house-dust mite allergen Der f 1 at indoor climatic conditions

Decay of house-dust mite allergen Der f 1 at indoor climatic conditions

Annals of Allergy Asthma and Immunology: Official Publication of the American College of Allergy Asthma and Immunology 89(1): 34-37

ISSN/ISBN: 1081-1206

PMID: 12141717

DOI: 10.1016/s1081-1206(10)61908-4

The decay of house-dust mite allergens is important for the outcome of avoidance measures for house-dust mite-allergic patients. To quantify the stability of Der f 1 from mattress dust when exposed to domestic conditions. Three samples of mattress dust were individually homogenized and divided into 64 subsamples. Mites were killed by freezing for 48 hours at -30 degrees C. The subsamples were exposed in eight homes, three storerooms, and one greenhouse, where temperature and relative humidity were recorded. Der f 1 was determined in extracts of subsamples (enzyme-linked immunoadsorbent assay) at 0, 3, 12, and 24 months. In the three samples of mattress dust, the initial concentrations of Der f 1 (mean +/- standard deviation; STD) were: 169 (12), 3.9 (0.4), and 31 (2.6) microg/g, respectively. Median half-life of Der f 1 in the mattress dust samples was 10 years in the exposure homes, 18 years in the store rooms, and 1.0 year in the greenhouse. No correlations among preserved Der f 1 and temperature, relative humidity, and absolute humidity in homes were found (Spearman rank correlation test). Natural decay of Der f 1, with an estimated half-life of 10 years at housing conditions, has no practical consequence in reducing allergen exposure. Therefore, avoidance measures should include an active removal of the allergens.

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