One of the most strongly allergenic materials found indoors is house
dust, often heavily contaminated with the faecal pellets and cast
skins of House Dust Mites. Estimates are that dust mites may be
a factor in 50 to 80 percent of asthmatics, as well as in countless
cases of eczema, hay fever and other allergic ailments. Common causes
of allergy include house dust mites, cat dander, cockroach droppings
and grass pollen. Symptoms are usually respiratory in nature (sneezing,
itching, watery eyes, wheezing, etc.), usually NOT A RASH. However,
there are reports of a red rash around the neck. Other allergic
reactions may include headaches, fatigue and depression.
The wheeze-inducing proteins are digestive juices from the mite gut which are quite potent. An exposure to the mites in the first, crucial year of life can trigger a lifelong allergy. There is no cure, only prevention. One must control house dust mite levels.
Beds are a prime habitat (where 1/3
of life occurs). A typical used mattress may have anywhere from
100,000 to 10 million mites inside. (Ten percent of the weight of
a two year old pillow can be composed of dead mites and their droppings.)
Mites prefer warm, moist surroundings such as the inside of a mattress
when someone is on it. A favorite food is dander (both human and
animal skin flakes). Humans shed about 1/5 ounce of dander (dead
skin) each week. About 80 percent of the material seen floating
in a sunbeam is actually skin flakes. Also, bedroom carpeting and
household upholstery support high mite populations.
How to Recognize the Symptoms of Allergies to Dust Mites
The protein substances in the dust mite faeces produce antibodies in humans who are allergic when these are inhaled or touch the skin. These antibodies cause the release of histamines which causes to nasal congestion, swelling and irritation of the upper respiratory passages. Typical symptoms of an allergy to dust mites include some or all of the following:
Hay fever, Watering eyes, runny nose,
itching, sneezing, Asthma, difficulty in breathing, Infantile eczema
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Source: www.ehso.com/ehshome/dustmites.php
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