Skin testing in predicting response to nasal provocation with alternaria.

Area of Science:

• Allergy and Immunology
• Respiratory Medicine
• Diagnostic Testing

Background:

• Allergic rhinitis diagnosis often relies on skin prick testing.
• Alternaria is a common mold allergen implicated in respiratory allergies.
• Predicting nasal reactivity to specific allergens like Alternaria using skin tests requires validation.

Purpose of the Study:

• To evaluate the effectiveness of epicutaneous and intradermal skin testing in predicting nasal responses to Alternaria antigen.
• To compare skin test results with objective measures of nasal obstruction and subjective symptom scores.

Main Methods:

• A prospective study involving subjects tested with Multi-Test II (MT) epicutaneous testing.
• Intradermal testing was performed on subjects with negative epicutaneous tests.
• Nasal cross-sectional area (CSA) was measured using acoustic rhinometry, alongside nasal provocation tests and symptom scoring.

Main Results:

• Epicutaneous testing demonstrated poor sensitivity (42%) and specificity (44%) for predicting nasal response.
• Intradermal testing only modestly improved sensitivity to 58%.
• Skin test-positive subjects did not exhibit significant changes in nasal CSA or symptom scores during nasal provocation.

Conclusions:

• Epicutaneous and intradermal skin testing may be insufficient for accurately assessing Alternaria reactivity.
• Mold allergies might involve immune mechanisms beyond simple IgE-mediated type I hypersensitivity.
• New diagnostic models and testing modifications are potentially needed for evaluating mold allergies.