THERE is no simple way to remove dust mite allergens from the home. Both dust mites and all the dust throughout the house accumulated over the years need to be removed. The task of removing house dust takes a concerted regular effort over years.

In order to improve your respiratory allergies (eg asthma, rhinitis), it is necessary to reduce the dust mite allergen levels to less than two-hundredths of the original allergen concentration.

Efforts to reduce allergen levels can be tremendously beneficial to the allergic individual. Using a combination of strategies such as allergen barriers on bedding, anti-dust mite sprays, removal of dust-trapping furniture and a regular washing routine can significantly lower the number of dust mites found in the bedroom, even in humid regions.

Some useful measures to reduce dust mite allergens in the homes are indicated here.

Go for cover. Dust mites by the millions are found in pillows, mattresses and old upholstery because of the large amount of food available to them from these sources.

A consistent feature of successful attempts to reduce dust mites has been the use of anti-dust mite allergicovers or barriers that totally encase mattresses, duvets, blankets and pillows.

These special-material tightly woven allergicovers for mattresses and pillows prevent dust mite allergens from escaping into the room from inside the bedding. Normal pillowcases and bed sheets are used above the allergicovers.

There are several types of anti-dust mite covers available in the market, but many are just useless as barriers for dust mite allergens. Pharmacies are likely to stock allergicovers supported by allergists but consult your doctor for advice on the best product.

These allergicovers can last for more than five years but during that period they should not be removed from the bedding items because removal will cause the release of allergens into the house environment.

If the allergicover is soiled and has to be washed, then take the bedding outside the house before removing the allergicover. In this way all allergens are released outside the house. Vacuum the bedding thoroughly and spray with anti-dust mite spray before re-encasing with the washed allergicover.

Sun protection. Placing bedding materials under the hot sun is a traditional alternative which has been used with great success. Subsequently, the items have to be beaten or vacuumed to remove the allergens.

Modern mattresses, however, are usually made of foam (compared to cotton-fibre fillings in the past). The hot sun would probably melt the foam and damage the foam mattress. Anyway, carrying these heavy items for sunning outside the house is not easily accomplished.

Many bedding items such as pillows or mattresses labeled "anti-dust mite" do not prevent dust mites from colonising these synthetic fabrics. At least one study shows that such items may have dust mites at levels similar to those noted in regular unlabelled items. Thus, regardless of the labelling, it is advisable to encase bedding materials with barrier allergicovers.

Wash it. All bedclothes (eg bed sheets, pillowcases and bedspreads) must be laundered weekly, preferably at 60 degrees centigrade or higher. Lower temperatures and detergents do not kill dust mites. It is likely that clothes, including sweaters and dressing gowns, are significant sources of dust mites. Wash or clean these clothes frequently and store them in sealed plastics bags if they are not used often.

Get rid of carpets. Do not keep carpets rolled up for occasional use in any part of the house. Carpets can harbour very large numbers of dust mites and pose serious problems for allergic asthmatics.

Every time someone walks over a carpet, dust mite allergens are spread throughout the house and the allergens take about two hours to settle in an undisturbed room. Replace carpets with varnished floorboards, vinyl and linoleum flooring, tiled or purpose-made wooden floors.

Regular ventilation of the room is desirable. However, if the carpets cannot be removed for any reason, then use anti-dust mite solutions every three months to treat the carpets and then vacuum regularly.

Careful of toys. Do not let children sleep with their furry toys. An excellent substitute is a little cotton blanket which can be washed regularly at 60 degrees centigrade or higher. Remove all furry toys from the house. Furry toys harbour large populations of dust mite.

Anti-dust mite sprays. Regular three-monthly use of anti-dust mite sprays (containing benzyl benzoate, which is safe) is effective in killing dust mites. These sprays can be used on all fabric items such as sofas, chairs, double-layered-curtains, rugs, mattresses and the like.

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