Furniture Furniture with wooden or leather surfaces reduces the<unk> <unk>  population. Bed linen<unk> <unk> -proof encasements to mattress, pillow, and duvet prevent chronic contact with allergens. Hot tumble drying a bed linen for 1 hour will kill 99% of<unk> s therein. Weekly changing the bed linen reduces the risk of exposure to<unk> <unk> s. Cotton covers not covered with complete mattress covers are very likely to become colonized by bacteria and molds; they must be cleaned periodically (at least every second to third month). Here, the<unk> <unk> s are beneficial as they return cotton to its original state after it has degraded by contact with bare skin.<unk> <unk>  eggs are freeze tolerant (−70 °C for 30 minutes); hatching can normally be prevented by exposure of fabrics to: * Direct sunlight for 3 hours or * Dry or wet heat of at least 60 °C (140 °F) for a minimum of 30 minutes.<unk> <unk> s drown in water. Good properties of anti-mite fabrics have been identified as being: * Thread count greater than 246. * Pore size of between 2 and 10 micrometres. This will prevent<unk> <unk>  faecal pellets that can be small as 10 µm. * Allergen impenetrability >99%. *<unk>  leakage of less than 4%. * Breathability between 2 and 6 cm3 s−1 cm−2. Indoor climate Allergy patients are advised to keep the relative humidity below 50%, if possible. Very few<unk> s can survive if the humidity is less than 45% (at ). However, they can survive if the humidity is high just for an hour and a half per day, for example due to moisture released to the air when cooking food.
Dust mite allergy
Insect sting allergy
Tree nut allergy
Garlic allergy
Wheat allergy
Shellfish allergy
Sesame allergy
Rice allergy