Introduction: Delayed allergy to red meat, also termed alpha-gal syndrome, is increasingly reported in adults and African communities, while pediatric cases remain rare. Case presentation: Here, we report on a 7-year-old Caucasian boy presenting with recurrent wheals since the age of 5 years old. Episodes with hives occurred around every 3 weeks, mainly in the evening. One of these episodes was also associated with angioedema. No clear trigger was identified. At the first visit, after excluding an infection and autoimmune thyroiditis, chronic spontaneous urticaria was suspected and symptomatic treatment with antihistamines was prescribed. Six months later, the boy presented at the emergency room with generalized urticaria, dyspnoea, and emesis. Symptoms resolved after administration of epinephrine and antihistamines. A detailed medical history after this event revealed that he had eaten three sausages as well as jelly beans containing gelatine several hours prior to this episode. More precisely, after eating the sausages and jelly beans during the day, he had shown some hives before going to bed, and later developed the other symptoms in the middle of the night, suggesting alpha-gal syndrome. In his history, several tick bites are reported. Immunoglobulin E levels for alpha-gal were clearly elevated, confirming the diagnosis of a delayed-appearing immunoglobulin E-mediated allergic reaction to alpha-gal. Emergency medication was prescribed and avoidance of red meat and gelatine-containing foods was recommended. Under this exclusion diet, the boy remained asymptomatic, with the exception of two accidents in the follow up of 3 years, one developing during a barbecue and the second after exceptionally eating marshmallows. Conclusion: A detailed clinical history led to the diagnosis of alpha-gal syndrome. Although alpha-gal syndrome is typically seen in adults, our case illustrates that children can also present with this potentially life-threatening allergy. Since alpha-gal syndrome is rare in Europe, the disease is not well known and often overlooked for several years, especially in children.

Background/Objectives: The prevalence of food allergy (FA) in children is increasing. Dysbiosis of the microbiome has been linked to FA but needs to be better understood. We aimed to characterize the gut and skin microbiome of young food-allergic children over time and within different types of immunoglobulin E (IgE)-mediated FA. Methods: We studied 23 patients, as a pilot study of an ongoing prospective multicenter cohort study including children < 2y with newly diagnosed IgE-mediated FA. Samples (feces/skin swabs) were collected at enrollment and at 1-year follow-up and sequenced for the bacterial 16S rRNA gene (hypervariable v1–v2 region). Results: Gut and skin bacterial diversity was significantly higher in patients compared with controls and increased over time (beta test, Shannon diversity, p < 0.01). Within different types of IgE-mediated FA, bacterial diversity was similar. Community composition differed significantly over time and within IgE-mediated FA types (PERMANOVA: p < 0.01). Several significantly different genus abundances were revealed. We observed a positive correlation between high total IgE and a high abundance of the genus Collinsella in patients with a higher number of allergies/sensitizations (≥3), and patients with tree nut and/or peanut allergy. Conclusions: This study revealed an increased bacterial diversity in children with FA compared with non-atopic children. Importantly, the gut and skin microbiome differed in their composition over time and within different types of IgE-mediated FA. These findings contribute to the understanding of microbiome changes in children with FA and indicate the potential of the genus Collinsella as a biomarker for tree nut and/or peanut allergy and possibly for allergy persistence.

AIM OF THE STUDY: Oral immunotherapy (OIT) is increasingly used for the treatment of childhood food allergies, with limited data available on cashew nut OIT. This real-life study investigated the safety and feasibility of cashew nut OIT, comparing it with peanut OIT, with a focus on the up-dosing process. METHODS: We analysed cashew nut (n = 24) and peanut (n = 38) OIT cases with treatment initiated between 2018 and 2022 at the University Childrenʼs Hospital Basel. All patients who commenced therapy within this time frame were enrolled without prior selection. Two different starting protocols were used. Within the up-dosing protocol, the nut intake was incrementally increased by 20–30% every 2 weeks until reaching a maintenance dose of 1 g of nut protein. After consuming the maintenance dose regularly for 18–24 months, a second oral food challenge was performed. Patients who passed this challenge were considered desensitised. The safety of the therapy was evaluated based on the severity of adverse reactions during the up-dosing phase. Symptom severity was evaluated using the validated ordinal food allergy severity scale (o-FASS-5). RESULTS: Over the study period, 33% of cashew nut-allergic and 63% of peanut-allergic patients experienced mild to moderate allergic reactions. Severe allergic reactions occurred in five peanut-allergic children with high baseline allergen-specific IgE levels. Six patients with peanut, and none with cashew nut OIT, discontinued the therapy due to adverse reactions. The mean duration to reach the maintenance phase was longer for children with asthma or another food allergy. Among children who already underwent the second oral food challenge, desensitisation was achieved in 91% (11 out of 12) of cashew nut- and 73% (11 out of 15) of peanut-allergic patients. CONCLUSION: Cashew nut OIT had a low severity of adverse reactions and was generally well-tolerated. However, patient characteristics influenced side effect risk and treatment duration, emphasising the need for individualised OIT strategies.

Evaluation of the cow’s milk (CM) and hen’s egg (HE) ladder to improve medical care of children with CM and/or HE allergy. Through an anonymous retrospective online questionnaire, we investigated parent perspectives regarding the therapy option of a CM and HE ladder in children with CM and/or HE allergy. Of the 54 families contacted, 29 took part in the study. 19/29 children had already completed the ladders when the survey took place. 19/29 children showed an allergic reaction during the treatment of whom 17 presented skin rashes. 16/29 parents were anxious to rise to the next step in the protocol. 15/29 had difficulties with the implementation of the therapy due to the child refusing the offered food and organizational issues. Medical support as well as the ladder as a therapy option were scored satisfactory. The participating parents were satisfied with the therapy option and medical care. We identified two main areas for improvement: First, the suggested food for every step should be more diverse, according to the families’ culture background and nutritional needs/demands. Second, to reduce anxiety regarding the therapy, parents must be informed that although allergic reactions are common, they remain mild. Furthermore, we will suggest step changes under medical supervision, especially in families with a slow progression of the food ladder. With these improvements, the duration of therapy could be shortened, thus reducing the risk of an allergic reaction, the need for medical care by an allergist and therefore reducing healthcare costs.

De nombreux enfants portent l'étiquette d'allergie médicamenteuse et cela peut avoir des conséquences à vie pour le patient, mais aussi pour l'ensemble de la société : un choix limité de traitements, potentiellement moins efficaces ou favorisant le développement de résistances, sans compter un impact économique plus élevé. Cependant, la plupart des enfants tolèrent en fait le médicament en cause lorsqu'ils sont réexposés lors d’un test de provocation orale (TPO) et ne sont donc pas allergiques. Le domaine des hypersensibilités médicamenteuses fait l’objet de nombreuses recherches mais des études précises sur leur épidémiologie et sur les outils diagnostiques font encore défaut chez l’enfant. Le TPO reste un moyen diagnostique essentiel chez les enfants présentant des réactions cutanées sans critère de gravité. Ces dernières années, la société européenne d'allergologie et d'immunologie clinique a publié des recommandations pour le diagnostic et la prise en charge des réactions d'hypersensibilité les plus fréquentes chez les enfants, que sont les réactions aux bétalactamines, aux anti-inflammatoires non-stéroïdiens (AINS), aux antiépileptiques et aux vaccins. C’est ce que nous proposons d’aborder dans cet aperçu.