Immediate- and delayed-type contact hypersensitivity in children older than 5 years with atopic dermatitis: a pilot...

Area of Science:

• Immunology
• Dermatology
• Pediatrics

Background:

• Atopic dermatitis (AD) is a common inflammatory skin condition in children.
• The role of food allergy in AD pathogenesis remains a subject of investigation.
• Accurate diagnostic methods for identifying relevant allergens in AD are needed.

Purpose of the Study:

• To investigate immediate- and delayed-type hypersensitivity to food and other allergens in children with AD.
• To compare various methods for detecting immediate-type hypersensitivity.
• To assess the clinical relevance of positive allergen reactions.

Main Methods:

• Prospective open study involving 30 children (aged 5-15) with persistent AD.
• Comparison of patch-scratch tests, skin application food tests, prick tests, and delayed-type patch tests for food allergens.
• Prick testing and patch testing (European standard series) for inhalant allergens.

Main Results:

• Positive reactions to food allergens were observed in a small number of patients across different tests, often without clinical symptoms.
• Delayed-type patch tests showed the fewest positive reactions to foods.
• Twenty children (67%) had positive reactions to inhalants via prick testing, with nickel being the most common allergen in patch tests.

Conclusions:

• Food allergy appears to play a limited role in children aged 5-15 with AD.
• Current hypersensitivity testing methods for food allergens in AD lack ideal predictive value.
• Dietary manipulation based on these tests may not consistently improve AD symptoms.