Although microscopic, dust mites can cause discomfort and are one of the most common causes of allergies. These tiny creatures, often found in homes, can cause various symptoms, which are easy to confuse with those of pet or pollen allergies. Let's decipher together the characteristic signs of a dust mite allergy.
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- Dust Mite Allergy: How Does It Manifest?
Dust Mite Allergy: How Does It Manifest?
- A Closer Look at Mites and Their Connection to Allergies
- Dust Mite Allergy: What are the Symptoms?
- How to recognize a dust mite allergy?
- How to better live with a dust mite allergy?
- Sources
A Closer Look at Mites and Their Connection to Allergies.
Dust mites are tiny organisms, invisible to the naked eye, belonging to the arthropod phylum. They have an average lifespan of three months and thrive in warm and humid environments, ideally at a temperature of 77-86°F. This is why these microorganisms are primarily found in bedding, household linens, upholstered furniture, and carpets. Contrary to popular belief, they are only minimally present in the air, due to their relatively large size (10 to 35 μm in diameter). Therefore, we inhale them during household activities or at night, when allergens are close to the respiratory tract.
Dust mites can thrive even in a clean house.
If mites are responsible for allergic reactions, it's due to the allergenic antigens they produce, substances recognized by the human body's Immunoglobulin E (IgE). This recognition triggers the recruitment of immune cells such as basophils, eosinophils, and mast cells, causing an inflammatory reaction and the release of histamine. This histamine then causes an increase in the dilation of blood vessels and an activation of sensory nerves, which are the origin of the symptoms of mite allergies.
Good to Know : An allergy to dust mites is different from an allergy to cat or dog hair. Therefore, it is possible to have a pet while being sensitive to dust mites.
10%
of the Swiss population is affected by dust mite allergies
10,000 dust mites
can be present in one gram of dust
Dust Mite Allergy: What are the Symptoms?
Dust mite allergies, often underestimated, can prove to be very burdensome in daily life. The associated symptoms usually manifest during the night or upon waking, times when exposure is at its peak because dust mites proliferate in warm and humid places like mattresses. Among the most common symptoms of dust mite allergies, we find the allergic rhinitis which is characterized by persistent nasal congestion accompanied by frequent sneezing and itching. A blocked nose is often associated with an overproduction of mucus, which can cause some respiratory discomfort.
Dust mite allergies are not confined to the respiratory tract: they can also affect the eyes and cause a allergic conjunctivitis. The eyes can then become red, irritated, watery, and ocular itching can occur throughout the day. In some individuals, an eczema-like skin rash may appear in the form of small red patches, accompanied by intense itching. This is particularly relevant for individuals suffering from atopic dermatitis, who see their usual symptoms worsen in the presence of dust mites.
How to recognize a dust mite allergy?
The symptoms of dust mite allergies resemble those of a common cold, pollen allergy, or pet hair allergy. However, each of these different conditions has unique characteristics that allow them to be distinguished from one another.
Characteristics | Dust Mite Allergy | Pollen Allergy | Allergy to Animal Fur | Common Cold |
---|---|---|---|---|
Main Symptoms | Runny or blocked nose, sneezing, irritated eyes, itching | Runny nose, sneezing, irritated eyes, scratchy throat, itching | Runny nose, sneezing, irritated eyes, itching | Runny or blocked nose, sore throat, cough, fatigue |
Period of Onset | All year round, primarily in winter | Spring (tree pollen) or summer (grasses, herbs) | All year round, depending on interactions with animals | All year round, primarily in winter |
Duration of Symptoms | Persistent as long as the exposure continues | Seasonal, associated with pollination periods | Varying based on exposure to animals | About one week |
Fever | No | No | No | Possible mild fever |
If you are unsure whether your symptoms are due to a dust mite allergy, do not hesitate to seek advice from your doctor. They can perform a skin test or a blood draw, in order to confirm the allergy.
How to better live with a dust mite allergy?
In addition to antihistamines or corticosteroids frequently prescribed by doctors to alleviate dust mite allergies, certain simple actions can significantly reduce the presence of dust mites in a household, which are responsible for the symptoms. It is first necessary to take action within the bedroom, the favorite habitat of dust mites. It is recommended to opt for cotton sheets, covers, and pillowcases as they can be washed weekly at 140°F, the necessary temperature to eliminate dust mites. The use of dust mite-proof covers is also advisable.
To prevent the accumulation of dust and mites, it may also be relevant to simplify the bedroom layout by removing objects that attract dust, such as thick curtains, carpets, and rugs, and favor blinds, hardwood, or tile floors, which are easier to clean. It is also recommended to vacuum at least once a week, if possible with a HEPA filter, a high-efficiency air filter, and to dust surfaces and shelves each time with a damp cloth.
Finally, airing out the different rooms of the house for ten minutes each day can help slow down the proliferation of dust mites, as they prefer warm environments. Additionally, using a dehumidifier helps maintain the humidity level below 50%, a threshold that inhibits the multiplication of dust mites. All these measures, when combined, contribute to creating a less favorable environment for dust mites, and thus less conducive to allergic reactions.
Sources
BOUTON C. & DUCOMMUN J. Allergie aux acariens : mythes et réalités. Allergo-immunologie (2009).
JACQUET A. Innate Immune Responses in House Dust Mite Allergy. International Scholarly Research Notices (2013).
DEMOLY P. Allergie aux acariens. Diagnostic, prise en charge et modalités de l’ITA chez les patients poly-allergiques. revue Française d'Allergologie (2017).
MILLER J. The Role of Dust Mites in Allergy. Clinical reviews in allergy and immunology (2019).
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