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Allergy to feathers

K Kilpiö1, S Mäkinen-Kiljunen, T Haahtela

  • 1South Karelia Central Hospital, Lappeenranta, Finland.

Allergy
|April 16, 1998
PubMed
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True feather allergy is rare. Most positive skin prick test reactions to feather extracts are likely due to coexisting house dust mite allergies, not actual feather sensitivity.

Area of Science:

  • Allergen immunotherapy
  • Clinical immunology
  • Environmental allergens

Background:

  • Feather allergy is suspected in patients with allergic symptoms.
  • Skin prick tests (SPT) are commonly used to diagnose allergies.
  • Differentiating true feather allergy from cross-reactivity is clinically important.

Purpose of the Study:

  • To investigate the prevalence of true feather allergy.
  • To determine if positive SPT reactions to feather extracts are due to feather allergens or cross-reactive mites.
  • To assess the clinical significance of feather allergy.

Main Methods:

  • Evaluated 269 adult patients with suspected allergies using SPT with feather extracts.
  • Utilized feather-mix radioallergosorbent test (RAST) and immunospot studies.

Related Experiment Videos

  • Performed RAST-inhibition studies to identify allergens in feather extracts.
  • Conducted nasal challenges with feather extract in a subset of patients.

    • Main Results:

    • Only 9% of patients reacted to commercial feather extracts; 14% of those with any inhalant allergy reacted.
    • Patients with positive feather extract SPT results frequently had positive house dust mite tests (P < 0.001).
    • Nasal challenges were negative; immunospot studies showed concomitant mite allergy; mite allergens confirmed in feather extracts.

    Conclusions:

    • True feather allergy is uncommon.
    • Positive SPT reactions to feather extracts are often caused by cross-reactivity with house dust mite allergens.
    • Accurate diagnosis requires differentiating feather allergy from mite allergy.