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In a home that previously had cats, it may take up to 20 to 30 weeks before the cat allergen concentration is reduced to the levels found in animal-free homes. You may be able to speed reduction of the cat allergen by replacing carpet with hard surface flooring, removing any upholstered furniture and drapes used by the former owners, and cleaning the walls. However, all homes, even those never occupied by a cat, will have a minimal level of cat dander that can be measured.
Your allergist should be able to provide medications to help reduce your upper and lower respiratory symptoms for as long as they are needed.