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Animal danders.

Elizabeth A Erwin1, Judith A Woodfolk, Natalie Custis

  • 1Asthma and Allergic Diseases Center, University of Virginia, PO Box 801355, Charlottesville, VA 22908, USA. tap2z@virginia.edu

Immunology and Allergy Clinics of North America
|October 4, 2003
PubMed
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Animal dander, like cat (Fel d 1) and dog (Can f 1) allergens, is abundant in homes, potentially causing allergic sensitization. High exposure may lead to immunologic tolerance rather than allergy, especially in children.

Area of Science:

  • Environmental Allergens and Immunology
  • Occupational and Environmental Medicine
  • Clinical Allergy and Immunology

Background:

  • Animals continuously shed proteins via dander, secretions, and excretions, contributing to indoor allergen levels.
  • Common pet allergens include Fel d 1 (cats), Can f 1 (dogs), and rodent urine proteins, found in measurable quantities in household dust.
  • Animal dander accumulation is independent of animal hygiene and provides organic material for bacterial growth in humid environments.

Purpose of the Study:

  • To investigate the relationship between animal allergen exposure, sensitization, and the development of allergic diseases, particularly asthma.
  • To explore the potential for high allergen exposure to induce immunologic tolerance instead of allergic responses.
  • To evaluate the effectiveness of allergen avoidance strategies for managing allergic conditions.

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Main Methods:

  • Analysis of protein quantities (e.g., Fel d 1, Can f 1, IgA, IgG) in household dust samples.
  • Assessment of endotoxin levels in homes with and without animals.
  • Review of existing data on allergen sensitization, asthma association, and tolerance induction in relation to animal exposure.

Main Results:

  • Significant levels of animal allergens are consistently found in dust, sufficient to cause sensitization.
  • High exposure to certain animal allergens may lead to non-allergic immune responses (IgG, IgG4) and immunologic tolerance.
  • Sensitization to cat, rat, dog, or mouse allergens is strongly associated with asthma development in children.

Conclusions:

  • Allergen avoidance may be less effective for primary prevention due to widespread environmental exposure, even in homes without the specific animal.
  • Controlled trials for allergen avoidance should consider environments like schools and homes without pets.
  • Further research is needed to understand the mechanisms by which dander allergens induce tolerance, distinct from other allergen types.