Allergen-impermeable covers (Allergy Control Products) were placed on the mattress,
box spring, and pillows of the child’s bed at this visit. Families were given a vacuum cleaner equipped with a high-efficiency particulate air (HEPA) filter and either a power brush (model S434-I, Miele) if the child’s bedroom or family room was carpeted
or a bare-floor brush (model S312-I, Miele) and instructed in its use.