title: High-efficiency particulate arrest-filter vacuum cleaners increase personal cat allergen exposure in homes with cats.
abstract: BACKGROUND
  On the basis of experimental chamber studies, vacuum cleaners with double-thickness bags and integral high-efficiency particulate arrest (HEPA) air filters are claimed to reduce airborne allergen levels and are currently recommended to allergic patients.
  
  
  OBJECTIVE
  The objective of this study was to investigate the effect of vacuum cleaning on personal inhaled cat allergen exposure in homes with cats.
  
  
  METHODS
  Five unused new vacuum cleaners were compared with an old non-HEPA filter vacuum cleaner. Each vacuum cleaner was tested in an experimental chamber and in 5 homes with cats. Inhaled cat allergen was measured by nasal air sampling.
  
  
  RESULTS
  New vacuum cleaners failed to leak any allergen in the experimental chamber. There was a significant increase in inhaled cat allergen during vacuum cleaning in homes (F = 48.39, df = 1.4, P =.002) with no difference between the old vacuum cleaner and the unused new vacuum cleaners (5-fold and 3-fold increase compared to baseline, respectively; F = 0.005, df = 1.4, P =.95).
  
  
  CONCLUSIONS
  The use of new HEPA-filter vacuum cleaners increases inhaled cat allergen in homes with cats. The use of HEPA-filter modern vacuum cleaners to reduce pet allergen exposure in the homes of pet owners should not be justified merely on the basis of experimental chamber data.
authors.affiliation: North West Lung Centre, Wythenshawe Hospital, Manchester, UK.
authors.forename: Robin B
authors.initials: RB
authors.lastname: Gore
authors.forename: Bethan
authors.initials: B
authors.lastname: Durrell
authors.forename: Sophie
authors.initials: S
authors.lastname: Bishop
authors.forename: Lisa
authors.initials: L
authors.lastname: Curbishley
authors.forename: Ashley
authors.initials: A
authors.lastname: Woodcock
authors.forename: Adnan
authors.initials: A
authors.lastname: Custovic
mesh_terms: D016902:Air Pollution, Indoor; D000485:Allergens / Q000032:analysis*; D000818:Animals; D002415:Cats / Q000276:immunology*; D004781:Environmental Exposure; D005374:Filtration; D006023:Glycoproteins / Q000032:analysis*; D006794:Household Articles; D014618:Vacuum
chemical_list: D000485:Allergens; D006023:Glycoproteins; C059296:Fel d 1 protein, Felis domesticus