Asthma and Allergies Caused by Dust Mites
Ranjith Obeyesekera M.Sc,
PhD K-HART International Pty.Ltd, Baulkham Hills, NSW 2153,
know that 300 million people worldwide are affected with
Asthma-related problems due to allergens and bad circulation
of air inside houses? Asthma is triggered by dust mites’
feces, dead mites, mould, and contaminated moisture
stagnated inside houses.
Over 50 million people in central & Southern Asia suffer
from asthma since 1980.In Europe the number is reaching 100
million. In Africa the Asthma related problems affected are
over 50 million. Among the developed countries, Australia
has 2 million people suffering from Asthma, 23.2 million
people are affected in United States, 9 million out of which
are children, and in United Kingdom 1.5 million people are
affected with Asthma related problems. Dust mites allergens
are one of the worst allergens cause Asthma, Eczema,
watering eyes, Hay fever, runny nose, sneezing, and
One of the major allergens which cause asthma and other
allergic reactions is originated by dust mites. This
allergen is dust mite feces. House dust mite allergy is very
common and is associated with asthma, eczema and allergic
rhinitis, especially in climates such as Australia where the
allergen is present in large amounts [1, 3]. A major site of
exposure to house dust mite allergen is the bed however it
is important to remember that dust mite allergen is found in
all rooms of the house. House dust mites can trigger
respiratory or dermatological conditions including asthma
and eczema. Symptoms can include:
tight feeling in the chest 
mites are microscopic creatures hardly seen by naked eye.
The length of a dust mite is not exceeding 420 µm and width
from 250 µm to 320 µm. They are globular shape and having a
translucent body with long hair on their striated cuticles.
They have 8 hairy legs.
Various microscopic insects live with us causing allergies.
mite do not bite or sting but harbor strong allergens in
their bodies as well as in their secretions, excreta and
shed skins. Constant contact with these allergens can
trigger respiratory and dermatological complaints in some
humans. Dust mites have a rudimentary alimentary system (no
stomach) and require most digestion to occur outside their
body. For this reason they secrete enzymes and deposit the
fungus aspergillus repens on dust particles, to enable the
fungus to pre-digest the organic matter with its enzymes.
Dust mites eat the same particle several times, only
partially digesting it each time.
We have found that several thousands of dust mites live in
pillows, mattresses, bed covers, surrounding & underneath of
beds, and carpets. Some times the number exceeds to several
millions. In addition to the dust mites above mentioned,
there are few other microscopic mites also live with them.
They all carry translucent bodies. Figure 1 shows various
mites that were found in bed sheets, mattresses, pillows,
and carpets. Unfortunately they are not visible in naked eye
to remove them. The dust mites move actively through thin
fibers of dust particles. With a vacuum cleaner it is hard
to remove all the dust mites as they are held to thin dust
fibers and move against vacuum flow. In addition to thin
fibers, there are dead mite bodies, dust mites’ feces, dead
human skin flakes, human hair, and other foreign matters are
existed in dust. It was revealed that dust mites can not fly
or move freely in the air without the help of lump of dust.
Some times they can be found under the bed with dust.
It is now possible to eliminate house dust mite population,
and dramatically reduce them by living in your bed day by
day. Actually the dreams come true. K-HART International
Pty.Ltd has researched and designed a series of products
which are capable to totally eliminate dust mites in
mattresses, pillows, carpets, and other beddings in doors.
In addition, the company has developed a dust mite
eliminator product for house pets. Allergic reactions are
dose-related, so the fewer dust mites you have in your home,
the less you may be troubled by respiratory or
children’s Hospital at Westmead-Parents-House dust mites
House dust mites-Better health channel
Dust mites, Department of Medical Entomology, Westmead
hospital, University of Sydney, 2009.
K-HART International Pty.Ltd. Technical papers,
Indoor Air Circulation, Healthy Homes, Health, Stuffiness,