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House dust mite allergen levels in a Singapore hospital
Abstract:
House dust mite allergens constitute one of the most important allergens in house dust. In this study, the levels of two common dust mite allergens, Der p I and Der f I, in a general hospital in Singapore were evaluated. Our results showed that these allergens were detected in 42/74 (or 57%) of the dust samples. Der p I was found to be the predominant allergen detected (p < 0.001). The allergen levels were, however, low with only 1/74 having a Der p I concentration above 2 micrograms g-1 dust. None of the samples had Der f I concentrations above this level. Of the various niches studied (mattresses, pillows, sofas, carpets, blinds and floors), the blinds and floors had the lowest concentration of allergen (p < 0.05). These low levels in the hospital compared to homes were attributed to the vigorous cleaning schedule in the hospital, the use of plastic to encased mattresses and pillows, vinyl covered sofas and vinyl lined floors. These practices may be adopted in the home as a means to reduce mite allergen exposure.
Insights
House dust mite allergens Der p I and Der f I were found in 57% of hospital dust samples. Low levels were detected, suggesting hospital cleaning practices may reduce mite allergen exposure in homes.
Area of Science:
- Allergy and Immunology
- Environmental Health
- Clinical Medicine
Background:
- House dust mites are a significant source of indoor allergens.
- Exposure to dust mite allergens is linked to allergic respiratory diseases.
Purpose of the Study:
- To quantify the levels of Der p I and Der f I allergens in a Singaporean hospital.
- To compare allergen levels in different hospital microenvironments.
- To identify factors contributing to low allergen levels in hospitals.
Main Methods:
- Dust samples were collected from various locations within a general hospital.
- Enzyme-linked immunosorbent assays (ELISA) were used to measure Der p I and Der f I concentrations.
- Statistical analysis was performed to identify significant differences in allergen levels.
Main Results:
- Der p I and Der f I were detected in 57% of the 74 dust samples.
- Der p I was the predominant allergen.
- Allergen levels were generally low, with only one sample exceeding 2 µg/g for Der p I.
- Blinds and floors showed the lowest allergen concentrations.
- Hospital environments had significantly lower allergen levels compared to typical homes.
Conclusions:
- Hospital environments in Singapore exhibit low levels of common dust mite allergens.
- Rigorous cleaning protocols and specific material choices (plastic encasements, vinyl flooring) contribute to reduced allergen burdens.
- These hospital practices offer potential strategies for mitigating mite allergen exposure in domestic settings.