Contribution of molecular diagnosis of allergy to the management of pediatric patients with allergy to pollen.
J Investig Allergol Clin Immunol 2009;
19:439-445. [PMID:
20128417]
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Abstract
BACKGROUND
Component-resolved diagnosis based on recombinant allergens facilitates treatment of multiple sensitization and/or crossreactivity in allergic patients.
OBJECTIVE
To assess the usefulness of molecular diagnosis in childhood allergies.
METHODS
A total of 162 children aged 4-16 years diagnosed with allergic rhinitis or asthma/rhinitis caused by pollen were referred for recombinant allergen-based diagnosis in 2006. Specific immunoglobulin (Ig) E against pollen allergens and purified recombinant Phleum pratense pollen allergens were measured using an in vitro quantitative assay, and considering the recombinant allergens Phl p 1+Phl p 5 as P pratense--specific allergens and Phl p 7+Phl p 12 as cross-reacting allergens. Conditional probability was calculated to determine the relationship between values for specific IgE against major allergens and those for cross-reacting allergens.
RESULTS
Specific IgE antibodies against P pratense were detected in 99.4% of serum samples, and cross-reacting allergens in 46%. Multiple sensitization to pollen was documented in 38% of patients, with Plantago lanceolata as the main cause. Conditional probability calculations showed that patients with specific IgE values of 75-80 kU(A)/L to Phl p 1+Phl p 5 were 75% (95% confidence interval) more likely to present values > or = 2 kUA/L to Phl p 7+Phl p 12.
CONCLUSIONS
Our results show that recombinant DNA technology can help diagnose allergy in cases of multiple sensitization and crossreactivity, and is therefore a promising option for improving prognosis and management of allergic pediatric populations.
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