House dust mite allergens seasonal
QUANTITIES of house dust mite allergens in bedding rise in the wake of humidity, and might not be easily reduced by laundering and mattress protectors, an Australian study suggests.The Childhood Asthma Prevention Study had previously shown in a randomised controlled trial that a systematic program of encasing bedding and frequent washing reduced asthma-causing allergens.
Now a review of seven years of study data has found that house dust mite allergens fluctuate seasonally, reaching a high in late autumn following the peak in mite numbers in late summer (Allergy 2007;62:1394-1400).
The study showed that the pattern of fluctuation in the beds of children in the intervention group was similar to that in the non-intervention beds.
This implied that either the interventions did not suppress climate-driven production of allergens, or that the allergens originated from other sites in the room and settled on the beds, the authors concluded.
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