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VOLUME 52 , ISSUE 4 ( October-December, 2010 ) > List of Articles

Original Article

Identification of IgE-Mediated Food Allergy and Allergens in Older Children and Adults with Asthma and Allergic Rhinitis

Raj Kumar, Dolly Kumari, Prakriti Srivastava, Vishal Khare, Hena Fakhr, Naveen Arora, S.N. Gaur, B.P. Singh

Keywords : Asthma, Rhinitis, Food allergy, Skin prick test, Enzyme linked immunosorbent assay, Double-blind, placebo-controlled food challenge

Citation Information : Kumar R, Kumari D, Srivastava P, Khare V, Fakhr H, Arora N, Gaur S, Singh B. Identification of IgE-Mediated Food Allergy and Allergens in Older Children and Adults with Asthma and Allergic Rhinitis. Indian J Chest Dis Allied Sci 2010; 52 (4):217-224.

DOI: 10.5005/ijcdas-52-4-217

License: CC BY-NC 4.0

Published Online: 10-06-2022

Copyright Statement:  Copyright © 2010; The Author(s).


Abstract

Background and objective. Prevalence of immunoglobulin (Ig) E-mediated food allergy is primarily reported for certain pediatric populations and adults. The present study was aimed to investigate the relative prevalence of food allergy and allergens in older children and adults with asthma and allergic rhinitis. Methods. Patients (12-62 years) were screened using standard questionnaire and skin prick-test (SPT) with common foods and aeroallergens. Specific IgE level was determined by enzyme linked immunosorbent assay (ELISA) and allergy was established by blinded food challenges. Results. Of 1860 patients screened, 1097 (58.9%) gave history of food allergy. Of the history positive patients skin tested (n=470), 138 (29.3%) showed a marked positive reaction to food extracts. Rice elicited positive SPT reaction in maximum number of cases 29 (6.2%) followed by blackgram 28 (5.9%), lentil 26 (5.5%), citrus fruits 25 (5.3%), pea 18 (3.8%), maize 18 (3.8%) and banana 17 (3.6%). The SPT positive patients showed elevated specific IgE levels (range: 0.8-79 IU/mL) against respective food allergens than normal controls (0.73 IU/mL, mean±2SD). Food allergy was confirmed in 21/45 (46.6%) of the patients by blinded controlled food challenges. The prevalence of food allergy was estimated to be 4.5% (2.6%-6.34%) at 95% confidence interval (95% CI) in test population (n=470). Sensitisation to food was significantly associated with asthma (p=0.0065) while aeroallergens were strongly related to rhinitis (p<0.01). Conclusions. Food allergy is estimated to be 4.5% in adolescents and adults with asthma, rhinitis or both. Rice, citrus fruits, blackgram and banana are identified as major allergens for inducing allergic symptoms.


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