IgE to cross-reactive carbohydrate determinants (CCD) in childhood: Prevalence, risk factors, putative origins.

BACKGROUND: IgE antibodies to cross-reactive carbohydrate determinants (CCD) are usually clinically irrelevant but they can be a cause of false positive outcomes of allergen-specific IgE tests in vitro. Their prevalence and levels have been so far cross-sectionally examined among adult allergic patients and much less is known about their origins and relevance in childhood. METHODS: We examined CCD with a cross-sectional approach in 1263 Italian pollen allergic children (Panallergen in Paediatrics, PAN-PED), as well as with a longitudinal approach in 612 German children (Multicenter Allergy Study, MAS), whose cutaneous and IgE sensitization profile to a broad panel of allergen extracts and molecules was already known. The presence and levels of IgE to CCD were examined in the sera of both cohorts using bromelain (MUXF3) as reagent and a novel chemiluminescence detection system, operating in a solid phase of fluorescently labelled and streptavidin-coated paramagnetic microparticles (NOVEOS, HYCOR, USA). RESULTS: IgE to CCD was found in 22% of the Italian pollen allergic children, mainly in association with an IgE response to grass pollen. Children with IgE to CCD had higher total IgE levels and were sensitized to more allergenic molecules of Phleum pratense than those with no IgE to CCD. Among participants of the German MAS birth cohort study, IgE to CCD emerged early in life (even at pre-school age), with IgE sensitization to group 1 and 4 allergen molecules of grasses, and almost invariably persisted over the full observation period. CONCLUSIONS: Our results contribute to dissect the immunological origins, onset, evolution and risk factors of CCD-sIgE response in childhood, and raise the hypothesis that group 1 and/or 4 allergen molecules of grass pollen are major inducers of these antibodies through an antigen-specific, T-B cell cognate interaction.

Primary and pollen-associated hazelnut allergy in school-aged children in Germany: A birth cohort study.

BACKGROUND: Primary hazelnut allergy is a common cause of anaphylaxis in children, as compared to birch-pollen associated hazelnut allergy. Population-based data on hazelnut and concomitant birch-pollen allergy in children are lacking. We aimed to investigate the prevalence of primary and pollen-associated hazelnut allergy and sensitization profiles in school-aged children in Berlin, Germany. METHODS: 1570 newborn children were recruited in Berlin in 2005-2009. The school-age follow-up (2014-2017) was based on a standardized web-based parental questionnaire and clinical evaluation by a physician including skin prick tests, allergen specific immunoglobulin E serum tests and placebo-controlled double-blind oral food challenges, if indicated. RESULTS: 1004 children (63.9% response) participated in the school-age follow-up assessment (52.1% male). For 1.9% (n = 19, 95%-confidence interval 1.1%-2.9%) of children their parents reported hazelnut-allergic symptoms, for half of these to roasted hazelnut indicating primary hazelnut allergy. Symptoms of birch-pollen allergy were reported for 11.6% (n = 116 95%-CI 9.7%-13.7%) of the children. Both birch-pollen allergy and hazelnut allergy associated symptoms affected 0.6% (n = 6, 95%-CI 0.2%-1.3%) of children. Assessment of allergic sensitization was performed in 261 participants and showed that almost 20% of these children were sensitized to hazelnut, being the most frequent of all assessed food allergens, or birch-pollen, the majority to both. CONCLUSIONS: Based on parental reports hazelnut-allergic symptoms were far less common than sensitization to hazelnut. This needs to be considered by physicians to avoid unnecessary changes in diet due to sensitization profiles only, especially when there is a co-sensitization to hazelnut and birch-pollen.

Impact of acupuncture on antihistamine use in patients suffering seasonal allergic rhinitis: secondary analysis of results from a randomised controlled trial.

BACKGROUND: Seasonal allergic rhinitis (SAR) is a common disease that has detrimental effects on the quality of life (QoL) of affected individuals. Approximately 18% of patients try to alleviate their symptoms through acupuncture. The ACUSAR (ACUpuncture in Seasonal Allergic Rhinitis) study (ClinicalTrials.gov registration no. NCT00610584) assessed the impact of acupuncture on SAR, showing significant improvements in rhinitis-specific QoL (RQoL) and in rescue medication (RM) use. OBJECTIVE: A secondary analysis of SAR patients' use of antihistamine. METHODS: Patients were randomised into three study groups: acupuncture plus RM, sham acupuncture plus RM, and RM alone. The patients documented their medication use before and during the intervention period (8 weeks). The main outcome was the number of days with antihistamine use. Statistical analyses were conducted using parametric and non-parametric tests. The robustness of the results was tested by sensitivity analyses using non-parametric bootstrapping. RESULTS: The data from 414 patients were analysed. The acupuncture group used antihistamines significantly less often compared with the other groups (acupuncture vs sham acupuncture: mean difference -4.49 days, p=0.01; acupuncture vs RM: mean difference -9.15 days, p<0.001). Approximately 38% of the acupuncture group did not use any antihistamine in contrast to only 16% in the RM group. The pre-post comparison suggested that the acupuncture patients did not need to increase the days of antihistamine use to alleviate their symptoms, unlike the other groups. CONCLUSIONS: Acupuncture appeared to significantly reduce the number of days of antihistamine use while improving RQoL and SAR symptoms; it can therefore be considered a valuable, additional treatment option for patients with SAR. TRIAL REGISTRATION NUMBER: NCT00610584; Post-results.

Modifying the infant's diet to prevent food allergy.

Recommendations and guidelines on the prevention of food allergy have changed in recent decades. The aim of this review of the current evidence and ongoing studies is to provide a comprehensive and up to date picture of prevention of food allergy for healthcare professionals. The review was undertaken as part of the European Union funded Integrated Approaches to Food Allergy and Allergen Management (iFAAM) study. This is a wide ranging project bringing together expertise across the breadth of food allergy research. Specifically, the review discusses dietary manipulation in food allergy prevention, and covers the possible preventive strategies of allergen avoidance, early allergen introduction, general nutrition and supplements, as well as other strategies, such as prebiotics and probiotics. The review concludes that despite agreement that allergen avoidance strategies should not be undertaken for allergy prevention, there is currently no consensus regarding what actions should be recommended beyond exclusive breastfeeding for the first 4-6 months of life. Recent and upcoming trial results, which are detailed in this review, should help inform the debate and add clarity to the topic.

Transcutaneous bilirubin after phototherapy in term and preterm infants.

OBJECTIVES: To compare transcutaneous bilirubin (TcB) readings with total serum bilirubin (TSB) after phototherapy, estimating the range of TcB where confirmation through blood sampling can be avoided. METHODS: Preterm and term neonates receiving in-hospital phototherapy underwent TcB measurements (device JM-103, TcB) alongside routine TSB before and after treatment. We calculated time-dependent safety margins for transcutaneous readings to correctly assign 99% of infants not to receive phototherapy. RESULTS: Between August 2011 and December 2012, 86 newborn infants (47 preterm, 39 term) underwent a total of 189 parallel measurements. Mean difference (TcB - TSB) before treatment was -0.6 mg/dL (SD, 1.9 mg/dL). Within the first 8 hours after phototherapy, TcB levels were -2.4 mg/dL (SD, 2.1 mg/dL) below TSB. Thereafter the difference gradually returned to pretreatment values (-1.8 mg/dL in 8-16 hours, -1.1 mg/dL in 16-24 hours, and -0.8 mg/dL after 24 hours), while variations remained stable over time (SD, 1.4-1.8 mg/dL). In the first 8 hours after treatment, TcB levels of -7.3 mg/dL below the individual phototherapy threshold allowed safe rejection of confirmatory blood sampling. After 8 hours, that safety margin was reduced to approximately -5.0 mg/dL. CONCLUSIONS: TcB measurements remain a valuable tool after phototherapy when time-dependent underestimation of TcB is being accounted for.