Drug – bio-affecting and body treating compositions – Preparations characterized by special physical form – Biocides; animal or insect repellents or attractants
Patent
1997-01-09
1999-06-29
Smith, Lynette F.
Drug, bio-affecting and body treating compositions
Preparations characterized by special physical form
Biocides; animal or insect repellents or attractants
424403, 81157, 8532, 8922, A01N 2500, A01N 2534
Patent
active
059165804
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to the use of pesticide-impregnated linings and/or coverings to control house dust mite populations. In particular, the invention relates to pyrethroid-impregnated netting for use in covering, e.g. a mattress.
The reported growth in house dust mice populations associated with domestic environments in Europe, the Americas, China and elsewhere is causing increasing concern. With the rising number of homes remaining at a constant favourable temperature and humidity, together with changes in house cleaning methods and types of bedding over the years, the numbers and survival of such creatures have risen sharply, particularly in the households of sufferers with eczema (and ichthyosis).
House dust mites are scavengers on dead organic matter found in abundance in the home, feeding principally on the shed skin scales of humans and animals. The mites, their faeces and products, are highly antigenic as contact or aero allergens in Atopic diseases, eg eczema, asthma and allergic rhinitis. Mite allergy may trigger severe exacerbation that can be life threatening in extrinsic asthma
In addition, house dust mites have, in recent years, become an increased focus of concern as many experts consider them to be instrumental in initiating clinical asthma in very young children. It is believed that repeated exposure to the allergens produced by the mites can trigger early stages of asthma which will then become established as a chronic disease affected by a large range of different allergens in the environment. Even if this direct causative action of dust mites on the initial onset of asthma proves to be incorrect, there is no doubt they cause immeasurable suffering to those with specific allergies or act as a trigger for asthma attacks.
House dust mites are to be found concentrated in many parts of the home, particularly soft furnishings, which provide a highly suitable environment. It is their association with bedding, however, which brings them into the closest and most prolonged contact with humans. Pillows, duvets and mattresses have been found not only to house large populations of house dust mites, but also copious amounts of their faeces.
In the last few years, it has become recognised that netting impregnated with synthetic pyrethroid insecticides are one of the most successful means of controlling insect borne diseases. When used as curtains or draped over doors and roof eaves, such netting can significantly reduce the numbers of insects which enter and survive inside houses. The most widespread use of such impregnated netting is, of course, for bed nets to prevent mosquitos from feeding on humans at night. Trials involving many millions of people around the world have proven this technique to be effective not only at preventing mosquitos feeding, but also at controlling the spread of diseases spread by insects, such as malaria.
There are several reasons why pyrethroid insecticides are ideal for this type of impregnated netting use. considered relatively safe for use on or near humans. Indeed, there are several preparations available on the market which can be applied directly onto the skin or hair which contain permethrin. used at extremely low doses and lead to rapid knockdown and kill, often within seconds or minutes of contact. giving excellent protection levels for six months or more. limited resistance in the field to these compounds.
Pyrethroid insecticides are available as a dusting powder which is designed to be used for the elimination of house dust mites. However, this does not provide for prolonged protection against infestation, and indeed depends on the efficiency of "dusting". In addition, it might be the case that dust particles themselves will aggravate any asthmatic conditions which people coming into contact with the bedding may have.
It has now been found that effective control of house dust mite populations can be effected by using an insecticide-impregnated cover adapted to fit around bedding, a mattress, etc.
Thus, in a first aspect, the present invention provides
REFERENCES:
patent: 5198287 (1993-03-01), Samson et al.
Lindsay et al, 1991, Pestic. Sci., vol. 32, pp. 397-411.
Shober Edward Wharton
Shober Sandra Metcalf
Demite Limited
Salimi Ali R.
Smith Lynette F.
LandOfFree
Method of pest control does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method of pest control, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of pest control will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1373876