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Investigators publish new data in the report 'Prevalence of Tyrophagus putrescentiae hypersensitivity in subjects over 70 years of age in a veterans' nursing home in Taiwan.' "Domestic mites are present in house dust samples throughout the world. Reports have shown a high prevalence of Tyrophagus putrescentiae (Tp) sensitization in Europe and Asia, and its importance and clinical relevance in elderly subjects have grown rapidly," scientists writing in the journal International Archives of Allergy and Immunology report.

"The main objective of this study was to investigate the prevalence of Tp sensitization in elderly subjects in a veterans' nursing home using mite allergen extracts and recombinant allergens. A total of 199 subjects were enrolled in this study: 112 elderly subjects from a nursing home and 87 healthy young adults from the hospital staff as controls. The prevalence of Tp hypersensitivity was determined by specific IgE measurements and basophil histamine release. Immunoblotting with or without inhibition with Dermatophagoides pteronyssinus (Dp) was performed to identify the major allergens and species-specific allergen to Tp. It was determined that 39.3% (44/112) of the elderly population were sensitized to Tp and 17.9% (20/112) to Tp alone. There was a significantly higher prevalence of Tp hypersensitivity in elderly subjects in comparison with the young adult population. In the age association study of Tp and Dp sensitization, the elderly subjects were more sensitized to Tp than to Dp (p=0.02). Among the elderly subjects with chronic obstructive pulmonary disease (COPD) 45.8% (11/24) were Tp sensitive. The major allergens, Tyr p 2 and Tyr p 3, were identified with molecular weights of 16 kDa (53%) and 26 kDa (50%) as determined by ELISA and immunoblot inhibition analyses. The prevalence of Tp sensitization was higher in elderly subjects, especially in patients with COPD," wrote E.C. Liao and colleagues, National Yang Ming University, Institute of Clinical Medicine.

The researchers concluded: "The high percentage of IgE-binding components to the allergens Tyr p 2 and Tyr p 3 indicated that both allergens may play a role in the pathogenesis of IgE-mediated allergic diseases in elderly populations."

Liao and colleagues published their study in International Archives of Allergy and Immunology (Prevalence of Tyrophagus putrescentiae hypersensitivity in subjects over 70 years of age in a veterans' nursing home in Taiwan. International Archives of Allergy and Immunology, 2010;152(4):368-77).

Additional information can be obtained by contacting E.C. Liao, National Yang Ming University, Institute of Clinical Medicine and Dept. of Tropical Medicine, Taipei, Taiwan, Taiwan.

Keywords: City:Taipei, Country:Taiwan, Allergens, Allergies, Allergy Medicine, Antigens, Asia, Taiwan.

This article was prepared by China Weekly News editors from staff and other reports. Copyright 2010, China Weekly News via VerticalNews.com.

Source Citation
"Researchers from National Yang Ming University, Institute of Clinical Medicine detail new studies and findings in the area of allergies." China Weekly News 3 Aug. 2010: 495. Health Reference Center Academic. Web. 6 Aug. 2010.
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