Recent research conducted by Woolcock Institute of Scientific Research, Australia, found dust mite removal and that of their allergens from carpets during normal vacuum cleaning to be “inconsistent and incomplete”. It showed standard vacuum cleaning to be ineffective as part of reducing exposure to asthma and allergy triggers.
Carpets can be a major source of dust mite allergen and regular vacuuming is one of the most typical ways of dust mite control and minimising exposure.
Instead of removing dust mite allergens in the depths of the carpets, the study results demonstrated that normal vacuuming moved the dustmite allergen around and within the carpet. As outlined by Woolcock researchers: “The results might help to explain the reasons why trials aimed at reducing people’s exposure to indoor allergens have had limited success.”
“Although soft furnishings for example beds contain a more concentrated source of allergy-causing protein made by house dust mites, the large size carpet means chances are it will contain a larger quantity of allergen than other things in the house. Allergen avoidance measures that rely solely on vacuuming could be of limited success unless more rigorous cleaning than standard home vacuuming is carried out.”
The research revealed that older carpets not only contain large amounts of dust mite allergens, but that the allergen occurs inconsistently throughout the carpets.
The Woolcock study also looked over types of vacuum cleaners. They discovered that vacuum cleaners with rotating brushes within the head removed more dirt and allergen from the carpets compared to those without, so long as the suction component of the cleaner is operating properly, preventing dust being re-circulated back into the air.
“Overseas studies have found that vacuum cleaners with two or three layer bags performed much better than those that have a single layer bag. The maintenance of the cleaner and integrity of seals and gaskets were critical factors in effective cleaning,” said Woolcock researchers. “There are lots of vacuum cleaners available on the market that boast of being suitable for allergy sufferers. The main aspect to consider is HEPA, high efficiency particulate air filtration that is finding its way into some inexpensive models.”
Further dust mite removal can be achieved by washing bedding items weekly in hot water at 55ºC, avoid non-washable items including doonas, quilts, sheepskins, curtains, regularly wash pillows and doonas, or else purchase dust mite covers. Place any stuffed toys in freezer for about 2 days .
Source: Woolcock Institute of Medical Research: June 2007.