Strategies include the following: Using synthetic fiber pillows and impermeable mattress covers Frequently washing bed sheets, pillowcases, and blankets in hot water Frequently cleaning the house, including dusting, vacuuming, and wet-mopping Removing upholstered furniture, soft toys, and carpets or frequently vacuuming upholstered furniture and carpets Exterminating cockroaches to eliminate exposure Using dehumidifiers in basements and other poorly aerated, damp rooms Using high-efficiency particulate air (HEPA) vacuums and filters Avoiding food triggers Limiting pets to certain rooms or keeping them out of the house For people with severe seasonal allergies, possibly moving to an area that does not have the allergen Adjunctive nonallergenic triggers (eg, cigarette smoke, strong odors, irritating fumes, air pollution, cold temperatures, high humidity) should also be avoided or controlled when possible.