Background: The barrier dysfunction of atopic dermatitis (AD) promotes epicutaneous sensitization to aeroallergens. This study aimed to evaluate the prevalence of food and aeroallergen sensitization in AD and to explore the relationship between allergen sensitization and the personal or family history of allergic rhinitis, conjunctivitis, asthma, eosinophil count, and AD severity of Nigerian patients.
Methods: Children and adults with AD who visited the dermatology clinic were included in this study. AD diagnosis was made using the modified Hanifin and Rajka criteria, and severity was rated and graded using the Scoring Atopic Dermatitis (SCORAD) index. Skin-prick test for 14 allergens (5 food and 9 aeroallergens) was used to assess IgE sensitization. To look for significant relationships, chi-square and odds ratio were used.
Results: Sensitization to at least one allergen was observed in 65.8% of the patients, sensitization to aeroallergen was 85% and to foods was 15%. More patients had concomitant allergic conjunctivitis (n=29) and only three had asthma. The mean age of onset of AD was 10.6±12.9 years, ranging from 2 months to 51 years, and a family history of atopy was observed in 49.4%. Majority had moderate AD and normal eosinophil count. Allergen sensitization in AD patients was significantly associated with the age of patients but not with personal or family history of allergic rhinitis, conjunctivitis, asthma, eosinophil count or AD severity.
Conclusion: Analysis of our result showed a high prevalence of food and aeroallergen sensitization in AD. Sensitization was not influenced by the presence of other allergic diseases, eosinophils and the severity of AD.
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