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What are house dust mites and how do I know if I’m allergic to them?

<p><em><a href="https://theconversation.com/profiles/deryn-lee-thompson-1449312">Deryn Lee Thompson</a>, <a href="https://theconversation.com/institutions/university-of-south-australia-1180">University of South Australia</a></em></p> <p>People often believe they are allergic to <a href="https://ahd.csiro.au/everything-in-our-homes-gathers-dust-but-what-exactly-is-it-where-does-it-come-from-and-why-does-it-keep-coming-back-is-it-from-outside-is-it-fibres-from-our-clothes-and-cells-from-our-skin/">house dust</a>. But of the <a href="https://www.allergy.org.au/patients/allergy-treatments/allergen-minimisation">20% of Australians</a> suffereing with allergies, a number are are actually allergic to microscopic <a href="https://www.healthdirect.gov.au/dust-mites">house dust mites</a>.</p> <p>House dust mites belong to the same family as spiders and ticks. They measure just 0.2-0.3 mm, with 50 fitting on a single pinhead. They <a href="https://www.intechopen.com/chapters/71977">live</a> for 65–100 days, and females lay 60–100 eggs in their life.</p> <p>House dust mites love temperate climates and humidity. They feed off the skin cells we and animals shed, as well as mould, which they digest using special enzymes. These enzymes are excreted in their poo about <a href="https://www.intechopen.com/chapters/71977">20 times a day</a>. They also shed fragments of their exoskeletons.</p> <p>All these fragments trigger allergies in people with this type of allergic rhinitis (which is also known as hay fever)</p> <h2>What are the symptoms?</h2> <p>When people with house dust mite allergy inhale the allergens, they penetrate the mucous membranes of the airways and eyes. Their body recognises the allergens as a threat, releasing chemicals including one called histamine.</p> <p>This causes symptoms including a runny nose, an itchy nose, eyes and throat, sneezing, coughing and a feeling of mucus at the back of your throat (known as a post-nasal drip).</p> <p>People with this type of allergy usually mouth breath, snore, rub their nose constantly (creating a nasal crease called the “dust mite salute”) and have dark shadows under their eyes.</p> <p>House dust mite allergy <a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7328274/">can also cause</a> poor sleep, constant tiredness, reduced concentration at work or school and lower quality of life.</p> <p>For people with eczema, their damaged skin barrier can allow house dust mite proteins in. This prompts immune cells in the skin to <a href="https://academic.oup.com/bjd/article/190/1/e5/7485663">release chemicals</a> which make already flared skin become redder, sorer and itchier, especially in children.</p> <p>Symptoms of house dust mite allergy occur year round, and are often worse after going to bed and when waking in the morning. But people with house dust mite allergy <em>and</em> pollen allergies find their year-round symptoms worsen in spring.</p> <h2>How is it diagnosed?</h2> <p>House dust mite allergy symptoms often build up over months, or even years before people seek help. But an accurate diagnosis means you can not only access the right treatment – it’s also vital for minimising exposure.</p> <p>Doctor and nurse practitioners can order a <a href="https://www.allergy.org.au/patients/allergy-treatments/allergen-minimisation">blood test</a> to check for house dust mite allergy.</p> <p>Alternatively, health care providers with <a href="https://www.allergy.org.au/hp/a-career-in-clinical-immunology-and-allergy">specialised allergy training</a> can perform skin prick tests. This involves placing drops of the allergens on the arm, along with a positive and negative “control”. After 15 minutes, those who test positive will have developed a mosquito bite-like mark.</p> <h2>How is it treated?</h2> <p>Medication options include one or a combination of:</p> <ul> <li>daily non-sedating antihistamines</li> <li>a steroid nasal spray</li> <li>allergy eye drops.</li> </ul> <p>Your health care professional will work with you to develop a <a href="https://www.allergy.org.au/images/stories/pospapers/ar/ASCIA_HP_Allergic_Rhinitis_2022.pdf">rhinitis (hay fever) medical management plan</a> to reduce your symptoms. If you’re using a nasal spray, your health provider will <a href="https://www.youtube.com/watch?v=_ytYj1TLojM">show you how to use it</a>, as people often use it incorrectly.</p> <p>If you also have <a href="https://www.nationalasthma.org.au/understanding-asthma/how-is-asthma-managed">asthma</a> or eczema which is worsened by dust mites, your health provider will adapt your <a href="https://www.nationalasthma.org.au/health-professionals/asthma-action-plans">asthma action plan</a> or <a href="https://medcast.com.au/qhub/eczema/resources">eczema care plan</a> accordingly.</p> <p>If you experience severe symptoms, a longer-term option is <a href="https://www.allergy.org.au/images/pc/ASCIA_PC_Allergen_Immunotherapy_FAQ_2024.pdf">immunotherapy</a>. This aims to gradually turn off your immune system’s ability to recognise house dust mites as a harmful allergen.</p> <p>Immunotherapy involves taking either a daily sublingual tablet, under the tongue, or a series of injections. Injections require monthly attendances over three years, after the initial weekly build-up phase.</p> <p>These are <a href="https://theconversation.com/im-considering-allergen-immunotherapy-for-my-hay-fever-what-do-i-need-to-know-190408">effective</a>, but are costly (as well as time-consuming). So it’s important to weigh up the potential benefits and downsides with your health-care provider.</p> <h2>How can you minimise house dust mites?</h2> <p>There are also important allergy minimisation measures you can take to reduce allergens in your home.</p> <p>Each week, <a href="https://www.allergy.org.au/component/finder/search?q=minimisation&amp;Itemid=100001">wash</a> your bedding and pyjamas in hot water (over 60°C). This <a href="https://www.nationalasthma.org.au/living-with-asthma/resources/patients-carers/factsheets/dust-mites-trigger-my-asthma">removes</a> house dust mite eggs and debris.</p> <p>Opt for doonas, covers or quilts that can be washed in hot water above 60°C. Alternatively, low-cost waterproof or leak proof covers can keep house dust mites out.</p> <p>If you can, favour blinds and wood floors over curtains and carpet. Dust blinds and surfaces with a damp cloth each week and vacuum while wearing a mask, or have someone else do it, as house dust mites can become airborne during cleaning.</p> <p>But beware of costly products with big marketing budgets and little evidence to support their use. A new mattress, for example, will always be house dust mite-free. But once slept on, the house dust mite life cycle can start.</p> <p>Mattress protectors and toppers commonly claim to be “hypoallergenic”, “anti-allergy” or “allergy free”. But their pore sizes are not small enough to keep house dust mites and their poo out, or shed skin going through.</p> <p>Sprays claiming to kill mites require so much spray to penetrate the product that it’s likely to become wet, may smell like the spray and, unless dried properly, may grow mould.</p> <p>Finally, claims that expensive vacuum cleaners can extract all the house dust mites are unsubstantiated.</p> <p><em>For more information, visit <a href="https://www.healthdirect.gov.au/dust-mites">healthdirect.gov.au</a> or the <a href="https://www.allergy.org.au/patients/allergy-treatments/allergen-minimisation">Australian Society of Clinical Immunology and Allergy</a>.</em><img style="border: none !important; box-shadow: none !important; margin: 0 !important; max-height: 1px !important; max-width: 1px !important; min-height: 1px !important; min-width: 1px !important; opacity: 0 !important; outline: none !important; padding: 0 !important;" src="https://counter.theconversation.com/content/240918/count.gif?distributor=republish-lightbox-basic" alt="The Conversation" width="1" height="1" /></p> <p><em><a href="https://theconversation.com/profiles/deryn-lee-thompson-1449312">Deryn Lee Thompson</a>, Eczema and Allergy Nurse; Lecturer, <a href="https://theconversation.com/institutions/university-of-south-australia-1180">University of South Australia</a></em></p> <p><em>Image credits: Shutterstock </em></p> <p><em>This article is republished from <a href="https://theconversation.com">The Conversation</a> under a Creative Commons license. Read the <a href="https://theconversation.com/what-are-house-dust-mites-and-how-do-i-know-if-im-allergic-to-them-240918">original article</a>.</em></p>

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How to get rid of dust mites for an allergen-free home

<p><strong>Getting rid of dust mites for good</strong></p> <p>Dust mites are unwelcome guests for anyone, but they are particularly brutal for people with allergies. Fortunately, there are plenty of tips for how to get rid of dust mites. A few household changes and sticking to a cleaning schedule can help you get a handle on the problem right away. And if you’re prone to sneezing, here are the best cleaning products for people with allergies.</p> <p>Taking simple steps to help eliminate these pesky creatures can drastically improve your allergy symptoms. “While dust mites themselves are not harmful to most people, their faeces can trigger allergic reactions in those who suffer from allergies and asthma,” says sleep expert, Martin Seeley. “This includes respiratory problems and skin irritation, and in a worst-case scenario, they can even compromise a person’s immune system.”</p> <p>Learning how to get rid of dust itself or how to clean carpet spills requires some expert know-how too. We gathered the best advice on how to get rid of dust mites.</p> <p><strong>What are dust mites?</strong></p> <p>Invisible to the naked eye, dust mites are microscopic creatures that thrive in warm and humid environments. According to domestic cleaner, “dust mites appear in many homes, especially where there is high humidity and lots of dust.” In other words, basically everyone has at least some dust mites in their home – particularly since dust mites consume dust and dead skin flakes (shed by people and their pets).</p> <p><strong>What do dust mites look like?</strong></p> <p>You can’t see dust mites without a microscope. But if you could see them (or conveniently have a microscope on hand), they are oval and have eight legs. “They are translucent and have a white or cream colour, which also makes them difficult to see against a light background,” Seeley points out.</p> <p><strong>Where do dust mites come from?</strong></p> <p>Dust mites get into the house in a variety of ways. “This includes through ventilation systems, on clothes or furniture, or even on pets,” Doss says. “They thrive in warm and humid environments, so it is important to keep your home dry and dust-free to reduce their presence.</p> <p><strong>How do I know if I have dust mites?</strong></p> <p>One sign of dust mites could simply be your body’s reaction to them in the form of allergy symptoms. “Symptoms that readers should look out for include sneezing, coughing, runny nose, itchy and watery eyes and difficulty breathing,” says Doss. “Dust mites are allergens because they produce proteins in their droppings and bodies, which can cause an allergic reaction when inhaled.” As you begin to react to these allergens, your body releases histamine, a chemical that leads to allergic symptoms such as itching and sneezing.</p> <p>However, another sign of dust mites is the presence of dust itself. “Visible signs of dust mite infestation include dust buildup on surfaces, particularly in areas where people spend a lot of time, such as beds and sofas,” says cleaner, Zak Fleming.</p> <p><strong>How to get rid of dust mites?</strong></p> <p>Despite their size, dust mites can inhabit nearly every surface where people tend to spend a lot of time. Beds and mattresses – plus carpets and upholstered furniture – are just some of the usual suspects hosting dust mites. Here’s what to do about it.</p> <p><strong>Vacuum regularly </strong></p> <p>Many people might not know that dust mites come into the home on clothing or shoes. So vacuuming the floors where dust mites can congregate is a great place to start. “Vacuum carpets and upholstered furniture at least once a week,” says Fleming. This will prevent the buildup of both dust and dust mites inside your home. “But be sure to use a vacuum with a HEPA filter,” he adds.</p> <p> </p> <p>HEPA stands for ‘high-efficiency particulate air,’ and a vacuum with a HEPA filter can trap many very small particles better than other vacuums. “You should also remember to vacuum under your bed, as this is another dust-mite hotspot,” says Seeley.</p> <p><strong>Wash your bedding</strong></p> <p>Dust mites consume dust, much of which contains human skin. So what better place for the dust mites to hang out than between the sheets? Fleming suggests washing bed sheets in hot water at 54° Celsius once a week to ensure you’ve removed all dust mites from the bed’s surface. </p> <p>To be extra careful, also dry your bedding on high heat (always check your sheets special care instructions). All this extra heat will kill the dust mites. While you’re at it, consider cleaning other cloth you regularly come into contact with, like bath towels.</p> <p><strong>Reduce humidity</strong></p> <p>Because dust mites thrive in high humidity, make your home a less tempting environment for them by decreasing your humidity levels. Doss recommends keeping it between 35 per cent and 50 per cent.  Architect, Chris Matthias, recommends using a dehumidifier, as this device will remove moisture from the air. “It is nearly impossible to completely eliminate dust mites, as they are a natural part of our environment,” he says.</p> <p><strong>Protect mattresses and pillows</strong></p> <p>“Using dust mite covers on mattresses and pillows creates a barrier between the dust mites and the person sleeping on the bed, reducing allergen exposure,” says Fleming. Keeping a barrier between skin and potential dust mites will help keep those with allergies unaffected by the dust mites. Opt for hypoallergenic covers or a mattress protector.</p> <p><strong>Reconsider your carpeting</strong></p> <p>Instead, choose hardwood or tile floors. While “vacuuming helps to remove dust mites from carpets,” Doss says harder floors are better. With all their porous surfaces, carpets can house dust mites quite easily. “So avoid carpets and rugs if possible,” she says.</p> <p><strong>Get rid of clutter</strong></p> <p>Since dust accumulates in even the oddest of crevices, it’s wise to reduce dust-collecting clutter. “Limit the amount of clutter and dust collectors in your home, such as books, magazines and stuffed animals,” says Doss. And once you’ve gotten rid of the extra stuff, make sure to clean all those nooks and crannies you’ve uncovered.</p> <p><strong>Lower room temperatures</strong></p> <p>While not always ideal for people who tend to feel cold, retaining a cool temperature – less than 20°Celsius – in your home will keep dust mites from multiplying. Keeping the environment unwelcome helps keep their numbers low enough that they can’t spread, says Matthias.</p> <p><em>Image credits: Getty Images</em></p> <p><em>This article originally appeared on <a href="https://www.readersdigest.co.nz/food-home-garden/how-to-get-rid-of-dust-mites-for-an-allergen-free-home?pages=1" target="_blank" rel="noopener">Reader's Digest</a>. </em></p>

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9 surprising ways to cut down indoor air pollution

<p>Many people assume pollution is just an outdoor problem but your home can also be polluted with mould and dust mites, making it an unhealthy environment.</p> <p>As Susan Olesik, Professor of Chemistry and Biochemistry at Ohio State University says: “As a society, we make sure that our houses are well-insulated, but we don’t think enough about exposure to all the things we place in our homes.”</p> <p>The air quality in and around buildings has a big effect on our health, and while you can feel the symptoms – shortness of breath, dizziness, nausea – right away, other health effects can come on years after exposure, according to the US Environmental Protection Agency (EPA). </p> <p><strong>Clear out old cigarette and e-cigarette smoke</strong></p> <p>Pulmonologist Dr Sumita Khatri notes that one of the most common indoor air pollutants is cigarette smoke, though newer e-cigarettes are another source. The vapour emitted when someone smokes e-cigarettes releases chemicals linked to lung disease.</p> <p>This rule also applies to the previous occupants of your home who may have smoked. “We have all heard of second-hand smoke but this is called third-hand smoke,” says Dr Khatri.</p> <p>“If you have a room that has been exposed to residual smoke, make sure to change the fabric or carpet, which can be a risk to children or people with chronic heart and lung problems,” she adds.</p> <p><strong>Don’t overwater indoor plants</strong></p> <p>Overwatering your plants can contribute to the growth of mould, and any water that leaks on to the floor invites mould growth as well, says Olesik. Put pebbles on top of the soil to discourage mould spores from getting into and polluting the air, walls and floor.</p> <p><strong>Clean under your fridge</strong></p> <p>The tray under your fridge is a veritable mould magnet. Adding salt reduces the growth of mould and bacteria. Clean under the refrigerator occasionally to get rid of dust and mould, and make sure your cleaning products are environmentally friendly, advises Dr Khatri. “Cleaning products can also be harmful, so consider green and natural cleaning products which release less harmful chemicals and fumes,” she says.</p> <p><strong>Freshen air naturally</strong></p> <p>Air fresheners and scented candles contain trace amounts of hazardous chemicals, though in amounts lower than most guidelines, so it’s OK to use them on occasion, says Oleski. But she warns against overdoing either approach to fresher air. “It’s better to open the window if the weather allows.” If not, turn on the AC. Air conditioners remove mould-friendly moisture and filter allergens entering the house. Just make sure to clean or change the filters often or you’ll just make things worse.</p> <p><strong>Give stuffed toys the deep freeze</strong></p> <p>That teddy bear could be riddled with dust mites! Regularly slip stuffed toys into a freezer bag and let them chill for three to five hours. The cold will kill any dust mites that could contribute to indoor air pollution, according to a 2017 report in the <em>Journal of Allergy and Clinical Immunology</em>.</p> <p><strong>Declutter</strong></p> <p>Regularly throw out or give away coats and other clothing you haven’t worn in ages. Put sports equipment in the garage where it belongs. When you’ve finished, you should be able to see all your closet floors and back walls.</p> <p>“Minimising clutter is a great way to improve air quality because it allows you to see dust and other contaminants that might be invisible,” says Dr Khatri. Now give everything a good vacuum and you’ll have significantly reduced the amount of dust in your house and cut down on your indoor air pollution.</p> <p><strong>Leave shoes at the door</strong></p> <p>Mud isn’t the only thing you track into your home, notes Oleski. Parking your shoes by the door keeps your floors clean and reduces indoor air pollution, especially pesticides tracked in from outdoors. “You know those signs that say ‘keep dogs off lawn?’” They should also apply to people,” she says.</p> <p><strong>Keep your pets clean</strong></p> <p>Just like you take off your shoes, always make sure to wipe off your pet’s paws when they come in from being outdoors. Towelling off their coat can also help prevent the spread of pollen indoors. And bathe them frequently to help dissolve the natural, allergy-causing substances in their sweat and skin that spread to their fur.</p> <p><em>Photo: Getty Images</em></p> <p><em> </em></p> <p><em> </em></p> <p><em> </em></p>

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Your bed sheets could be making you sick

<p>After a long hard day there’s nothing better than to fall into a comfy bed for a restful night’s sleep, right? Maybe not, according to home hygiene expert Dr Lisa Ackerley, millions of tiny organisms, such as dust mites and dead, castaway skin cells live in our bed sheets.</p> <p>Our mattresses, doonas, and pillows are reservoirs of human skin cells, which encourages dust mites and increases our risk of suffering a cold as well allergies.</p> <p>But that’s not all – our bed linen can harbour bacteria that causes nasty illnesses like the flu and food poisoning. Dr Ackerley calls this "sick bed syndrome" and said most people don't realise it's happening to them.</p> <p>She told the <a href="http://www.dailymail.co.uk/health/article-3063876/Is-BED-making-ill-Expert-warns-dust-mites-germs-living-sheets-cause-asthma-hayfever-flu-food-poisoning.html">DailyMail:</a> “Humans shed half an ounce of skin week and a lot of that will be in the bed.</p> <p>“Dust mites like warm moist environments, the bed’s the perfect environment. They reproduce so there will be about 10 million per bed.</p> <p>“Often people are away in the day, so they shut the windows and the moisture stays in the house.</p> <p>“If you make the bed when you go out that traps the duvet and the moisture, and the dust mites have a great time.”</p> <p>She added, in two years around 10 per cent of the weight of a pillow will be made up of dust mites and their droppings.</p> <p>While dust mites themselves won’t cause you to get sick, their faeces and body fragments can irritate allergies, eczema, hay fever and asthma.</p> <p>"If people have a cold, it can survive on the bed linen and it can survive a wash. Someone with food poisoning could be excreting salmonella into the bed," Dr Ackerley added.</p> <p>So how exactly do you get rid of these dust mites and bacteria? Dr Ackerley recommends washing bed linens at a low temperature, using an antibacterial detergent. She also suggests keeping your widows open when possible to let some of the humidity and moisture out to reduce the likelihood of dust mites breeding in your sheets.</p> <p><strong>Related links: </strong></p> <p style="margin: 0px 0px 10px; padding: 0px; border: 0px; outline: 0px; font-size: 15px; vertical-align: baseline; color: #000000; font-family: 'Open Sans'; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; line-height: 24px; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; background: #ffffff;"><span style="text-decoration: underline;"><strong><a style="margin: 0px; padding: 0px; font-size: 15px; vertical-align: baseline; border: 0px none; outline: 0px none; text-decoration: underline; color: #20831d; background: transparent none repeat scroll 0% 0%;" href="/news/news/2016/07/7-common-items-you-should-never-put-in-a-dryer/"><em style="margin: 0px; padding: 0px; border: 0px; outline: 0px; font-size: 15px; vertical-align: baseline; background: transparent;"><span style="margin: 0px; padding: 0px; border: 0px none; outline: 0px none; font-size: 15px; vertical-align: baseline; background: transparent none repeat scroll 0% 0%;">7 common items you should never put in a dryer</span></em></a></strong></span></p> <p style="margin: 0px 0px 10px; padding: 0px; border: 0px; outline: 0px; font-size: 15px; vertical-align: baseline; color: #000000; font-family: 'Open Sans'; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; line-height: 24px; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; background: #ffffff;"><span style="text-decoration: underline;"><strong><a style="margin: 0px; padding: 0px; font-size: 15px; vertical-align: baseline; border: 0px none; outline: 0px none; text-decoration: underline; color: #20831d; background: transparent none repeat scroll 0% 0%;" href="/news/news/2016/07/reason-buttons-on-mens-and-womens-shirts-are-on-opposite-sides/"><em style="margin: 0px; padding: 0px; border: 0px; outline: 0px; font-size: 15px; vertical-align: baseline; background: transparent;"><span style="margin: 0px; padding: 0px; border: 0px none; outline: 0px none; font-size: 15px; vertical-align: baseline; background: transparent none repeat scroll 0% 0%;">Reason buttons on men’s and women’s shirts are on opposite sides</span></em></a></strong></span></p> <p style="margin: 0px 0px 10px; padding: 0px; border: 0px; outline: 0px; font-size: 15px; vertical-align: baseline; color: #000000; font-family: 'Open Sans'; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; line-height: 24px; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; background: #ffffff;"><span style="text-decoration: underline;"><strong><a style="margin: 0px; padding: 0px; font-size: 15px; vertical-align: baseline; border: 0px none; outline: 0px none; text-decoration: underline; color: #20831d; background: transparent none repeat scroll 0% 0%;" href="/lifestyle/home-garden/2016/07/ways-you-are-doing-your-ironing-wrong/"><em style="margin: 0px; padding: 0px; border: 0px; outline: 0px; font-size: 15px; vertical-align: baseline; background: transparent;"><span style="margin: 0px; padding: 0px; border: 0px none; outline: 0px none; font-size: 15px; vertical-align: baseline; background: transparent none repeat scroll 0% 0%;">10 ways you’re doing your ironing wrong</span></em></a></strong></span></p>

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