The effect of vacuum cleaners on the concentration and particle size distribution of airborne cat allergen: Clinical aspects of allergic disease. Judith A. Woodfolk, MB, ChB, Christina M. Luczynska, PhD, Frederic de Blay, MD, Martin D. Chapman, PhD and Thomas A.E. Platts-Mills, MD, PhD, J. Allergy Clin. Immuno., Volume 91, no. 4