Atopy Patch Test in the Diagnosis of Food Allergens in Infants with Allergic Proctocolitis Compared with Elimination/Introduction Challenge

Allergic proctocolitis is a cell-dependent food allergy that is present in both breast and formula-fed infants. The presence of blood with different amounts in the stool is the main manifestation of the disease. Different results have been published on the accuracy and specificity of the atopic patch test (APT). The purpose of this study was to evaluate the results of the APT and compare them with those obtained in the food elimination/introduction (E/I) challenge, as the gold standard of confirming the allergy. Twenty-eight patients (18 boys, 10 girls, <1 year) with allergic proctocolitis were recruited in this study. The mean age of the disease onset and enrolling the study were 2.23±1.7 and 5.25±2.19 months, respectively. After performing APT with fresh foods, an E/I challenge was done in a patient with positive tests, and results were analyzed. APT was positive in 14/28 (50%) individuals. The most common foods detected by APT in all of the individuals were: milk (10/28), rice (5/28), soy (4/28), and egg white (4/28), while in E/I challenge in the APT-positive individuals were: milk (8/10), rice (3/5), egg white (1/4), and soy (0/4). APT was positive in half of the infants<1 year with allergic proctocolitis and there was no significant correlation between the APT results and the E/I challenge test for all foods. Comparing the results of APT and E/I challenge methods showed a convergence between the milk and rice sensitivity, thus we suppose APT to be a useful tool in identifying these two allergens in cell-mediated food allergies like allergic proctocolitis.

Esophageal microbiome in active eosinophilic esophagitis and changes induced by different therapies

Eosinophilic esophagitis (EoE) is a chronic, immune-mediated inflammatory esophageal disease triggered by food antigens. Cumulative evidence supports the implication of microbiota and the innate immune system in the pathogenesis of EoE. Changes in the esophageal microbiome were investigated by applying 16S rRNA gene sequencing on esophageal biopsies of adult patients with active EoE at baseline (n = 30), and after achieving remission with either proton pump inhibitors (PPI, n = 10), swallowed topical corticosteroids (STC, n = 10) or food-elimination diets (FED, n = 10). Ten non-EoE biopsies were also characterized as controls. Compared to controls, no differences in alpha (intra-sample) diversity were found in EoE microbiota overall. However, it decreased significantly among patients who underwent FED. As for beta (inter-sample) diversity, non-EoE controls separated from EoE baseline samples. Post-treatment samples from patients treated with PPI and FED had a more similar microbiota composition, while those receiving STC were closer to controls. Differential testing of microbial relative abundance displayed significant changes for Filifactor, Parvimonas and Porphyromonas genera. Analysis of predicted functions indicated alterations in metabolic pathways and abundance of sulphur-cytochrome oxidoreductases. Our findings demonstrate changes in microbiota associated with EoE, as well as a treatment effect on the microbiome.

Clinical Characteristics and Treatment Outcomes of Patients with Eosinophilic Esophagitis and Eosinophilic Gastroenteritis

<b><i>Background:</i></b> Eosinophilic esophagitis (EoE) and eosinophilic gastroenteritis (EGE), part of the spectrum of eosinophilic gastrointestinal disorders (EGID), share pathogenic similarities. We examined differences regarding clinical characteristics and treatment outcomes between EoE and EGE cases. <b><i>Methods:</i></b> Two-hundred fifteen EGID patients, including 181 with EoE and 34 with EGE, diagnosed at Shimane University Hospital between February 2011 and March 2019 were enrolled. Information regarding clinical parameters and treatment outcomes was reviewed. <b><i>Results:</i></b> EoE showed significant male predominance (82.3%) as compared with EGE (50.0%) (<i>p</i> &#x3c; 0.001). Furthermore, patients with EoE were significantly older and had a higher body mass index (24.8 ± 4.0 vs. 22.2 ± 4.3, <i>p</i> &#x3c; 0.05). Over 90% of the EoE patients were initially given proton pump inhibitor (PPI) treatment, of whom 73.2% showed clinical and histological remission. Vonoprazan, a more potent acid inhibitor than PPI, was effective in two-thirds of the nonresponsive EoE patients initially treated with a PPI. In contrast, oral glucocorticoid administration was mainly given to patients with EGE (58.8%). Of 13 EGE patients treated with a food-elimination diet, responsible foods were successfully identified in 9, with 7 controlled in a state of remission without glucocorticoid therapy. <b><i>Conclusions:</i></b> We found different clinical characteristics and treatment strategies in the present EoE and EGE cases. Most of the EoE patients responded to and were maintained by acid suppressive therapy, using PPI or vonoprazan. For EGE patients, glucocorticoid administration was mainly used though food-elimination diet therapy also showed beneficial effects.

Eosinophilic gastritis-a rare diagnosis

Introduction: Eosinophilic Gastritis (EG), one of the less common amongst Eosinophilic Gastrointestinal Disorders (EGID),with a prevalence of 6.3 cases/100.000, is an uncommon cause of unspecific abdominal symptoms, including epigastric pain.Case: A 23-year-old female, was admitted with recurrent episodes of nausea, vomiting, abdominal pain and weight loss. She was discharged one week previously after being treated for similar symptoms. The patient had failed an outpatient treatment with a Proton Pump Inhibitor (PPI). During her re-admission, Esophagogastroduodenoscopy (EGD) was performed, and results were significant for gastritis without ulcers or esophagitis. While awaiting biopsy results, the patient experienced a minimal improvement in her symptoms with intravenous fluids and PPI. Extensive workup remained negative except of eosinophilia in peripheral blood. Gastric mucosal biopsy revealed eosinophilic infiltrates in Lamina Propria, confirming the diagnosis of Eosinophilic Gastritis. Helicobacter pylori on immunohistochemistry was negative. The patient was counseled regarding the Six Food Elimination Diet for the management of this condition. Her symptoms began to improve under dietary restrictions. Repeated EGD with biopsy at 12 weeks showed resolved eosinophilic infiltrates.Discussion: EG remains a rare diagnosis, and it should be included as a differential diagnosis in every patient with refractory symptoms of nausea, vomiting, abdominal pain, and failure to thrive. Diagnosis of EGID is established after the exclusion of other causes of eosinophilia in the gastrointestinal tract.