NOVEOS and ImmunoCAP Have Similar Performances for Diagnosing Food Allergies.

BACKGROUND: The clinical significance of newly available platforms for specific IgE measurement must be evaluated. However, data are lacking for NOVEOS (Hycor), especially for food allergens. OBJECTIVE: We compared the technical and clinical performance of two platforms (ImmunoCAP and NOVEOS) to measure specific IgE to 10 food allergens. METHODS: Sera from 289 clinically characterized patients were tested for IgE specific for six food allergen extracts (egg white, cow's milk, peanut, hazelnut, fish, and shrimp) and four molecular allergens (Gal d 1, Bos d 8, Ara h 2, and Cor a 14). Specific IgE measurements were carried out using ImmunoCAP and NOVEOS methods. Food allergy diagnoses were established according to international guidelines. RESULTS: A strong correlation (ρ > 0.9) was present between the two platforms whereas specific IgE concentrations measured with NOVEOS were consistently lower (mean, -15%) than with ImmunoCAP. NOVEOS and ImmunoCAP provided similar overall odds ratios and relative risks for food allergy diagnosis with both allergen extracts and molecular allergens. When all 10 allergens were considered, NOVEOS provided better receiver operating characteristic curves (P = .04). Finally, we found that the most discordant results were observed with hazelnut and peanut extracts and were related to cross-reactive carbohydrate determinants for these two with ImmunoCAP. CONCLUSIONS: Specific IgE determination by either ImmunoCAP or NOVEOS (odds ratios of allergy, 25.1 or 33.0, respectively) is highly informative regarding the risk of allergy in the selected population. The NOVEOS platform presents the advantage of being less affected by unwanted reactivity owing to carbohydrate determinant-specific IgE while requiring a 10-fold lower test sample volume.

Evaluation of baked egg oral immunotherapy in French children with hen's egg allergy.

BACKGROUND: Introduction and gradual incremental escalation of a low dose of baked egg may accelerate the resolution of severe hen's egg (HE) allergy for some children. The purpose of our study was to evaluate the efficacy and safety of baked egg oral immunotherapy (OIT) in children with HE allergy after a low-dose baked egg oral food challenge (OFC). METHODS: In a retrospective analysis of OFC performed between 2013 and 2018 at the Children's Hospital of Toulouse (France), we identified 71 children with HE allergy and high egg-white (EW) and ovomucoid specific IgE levels, who underwent a total of 164 OFC (71 baked egg, then 93 unbaked egg). Mean age at first low-dose baked egg OFC was 6 years. Median EW specific IgE was 14.0 kUA/L, and median ovomucoid specific IgE was 11.7 kUA/L. RESULTS: Most children were treated with baked egg OIT. Our study shows that 78.9% of the children did not react to first low-dose baked egg OFC (702 mg of HE protein). 8.7% of children discontinued OIT at home. Finally, desensitization to unbaked HE was achieved in 47 children (66.2% of children allergic to HE). Children with lower EW specific IgE levels had a significantly higher probability of becoming desensitized to HE. We did not report any anaphylactic reactions to baked egg OIT. CONCLUSION: Most children with HE allergy and high egg-white (EW) and ovomucoïd specific IgE levels tolerate the introduction of baked egg. Baked egg OIT is safe, and anaphylaxis to baked egg OIT has not been observed.

Benefits of baked milk oral immunotherapy in French children with cow's milk allergy.

BACKGROUND: Introduction and gradual incremental escalation of a low dose of baked milk may accelerate the resolution of severe cow's milk (CM) allergy for some children. The purpose of our study was to evaluate the efficacy and safety of baked milk oral immunotherapy (OIT) in children with CM allergy after a low-dose baked milk oral food challenge (OFC). METHODS: In a retrospective analysis of OFC performed between 2013 and 2018 at the Children's Hospital of Toulouse (France), we identified 64 children with CM allergy and high milk and casein-specific IgE levels, who underwent a total of 171 milk OFC. Mean age at 1st OFC was 4.8 years. Mean CM-specific IgE was 47.9 kUA/L, and mean casein-specific IgE was 42.3 kUA/L. RESULTS: Most children were treated with baked milk OIT. Our study shows that 67.2% of the children did not react to 1st low-dose baked milk OFC (168.6 mg of CM protein). Eighteen percent of children stopped the OIT at home. Finally, desensitization to fresh milk was achieved in 27 children (42.2% of children allergic to CM). Children with lower CM-specific IgE levels have a significantly higher probability of becoming desensitized to unbaked CM. CONCLUSION: Most children with CM allergy and high milk and casein-specific IgE levels tolerate the introduction of baked milk. However, the occurrence of anaphylactic reactions during OIT remains possible.

Pulmonary Alveolar Microlithiasis in Children Less than 5 Years of Age.

OBJECTIVE: To collect all published cases up to January 2019 of pulmonary alveolar microlithiasis (PAM) in patients age 5 years and under and to compare their characteristics with those of the 1022 cases in the most recent all-age cohort published in 2015. STUDY DESIGN: We identified 28 cases of PAM worldwide in children age 5 years and under, accounting for only 2%-3% of all cases. RESULTS: Children seem more frequently symptomatic, notably with more cough and severe acute respiratory failure, but had no reported extrapulmonary manifestation. Children with PAM evidenced less typical radiologic findings, with frequent ground glass opacities not reported in adult cases and milder calcifications as less frequent, smaller, and mainly restricted to the lower lobes. CONCLUSIONS: PAM remains an uncommon diagnosis in young children, as symptoms and radiologic findings are less specific. Physicians should be aware to look for calcifications in chest computed tomography at mediastinal window and avoid elution of the bronchoalveolar lavage to find microliths. Collecting longitudinal data through an international registry would help in characterizing PAM to predict disease progression and plan lung transplantation.