ABSTRACT
Recently, the National Institute of Allergy and Infectious Diseases sought to establish consistency in definitions, diagnostic criteria, and management practices concerning food allergies (FAs). This review aimed to summarize and highlight the relevant findings of these guidelines for the emergency department provider, as pediatric patients often present to the emergency department with FAs or other disorders mimicking FAs.
Subject(s)
Anaphylaxis/diagnosis , Food Hypersensitivity/diagnosis , Anaphylaxis/drug therapy , Child , Diagnosis, Differential , Emergency Service, Hospital , Food Hypersensitivity/drug therapy , HumansABSTRACT
BACKGROUND: Anaphylaxis to egg or severe egg allergy has been considered a contraindication to receiving trivalent seasonal influenza vaccine (TIV). OBJECTIVE: To evaluate the safety of TIV among severely egg allergic children. METHODS: A 2-phase, multicenter study at 7 sites was conducted between October 2010 and March 2012. Inclusion criteria included a history of a severe reaction, including anaphylaxis, to the ingestion of egg and a positive skin test result or evidence of serum specific IgE antibody to egg. Phase 1 consisted of a randomized, prospective, double-blind, placebo controlled trial of TIV administration to egg allergic children, using a 2-step approach; group A received 0.1 mL of influenza vaccine, followed in 30 minutes if no reaction with the remainder of an age-appropriate dose, whereas group B received an injection of normal saline followed in 30 minutes if no reaction with the full 100% of the age-appropriate dose. Phase 2 was a retrospective analysis of single dose vs split-dose administration of TIV in eligible study participants who declined participation in the randomized controlled trial. RESULTS: Thirty-one study participants were prospectively evaluated in the randomized controlled trial (group A, 14; group B, 17); 45.1% had a history of anaphylaxis after egg ingestion. A total of 112 participants were retrospectively evaluated (87 with the single dose and 25 with the split dose); 77.6% of participants had a history of anaphylaxis after egg ingestion. All participants in both phases received TIV without developing an allergic reaction. CONCLUSION: TIV administration is safe even in children with histories of severe egg allergy. Use of 2-step split dosing appears unnecessary because a single dose was well tolerated.
Subject(s)
Egg Hypersensitivity/immunology , Influenza Vaccines/administration & dosage , Influenza, Human/immunology , Influenza, Human/prevention & control , Anaphylaxis/immunology , Anaphylaxis/prevention & control , Child , Double-Blind Method , Female , Humans , Influenza Vaccines/adverse effects , Influenza Vaccines/immunology , Male , Prospective Studies , Retrospective StudiesABSTRACT
Food allergies are immune-mediated responses to food proteins. Because of differences in the underlying immunologic mechanisms, there are varying clinical presentations of food allergy. This article discusses the manifestations of IgE-mediated disorders, including urticaria and angioedema, rhinoconjunctivitis, asthma, gastrointestinal anaphylaxis, generalized anaphylaxis, food-dependent exercise-induced anaphylaxis, and oral allergy syndrome. It also reviews the presentations of mixed IgE- and cell-mediated disorders, including atopic dermatitis and eosinophilic gastrointestinal disorders. Finally, the manifestations of cell-mediated food allergies are discussed, including dietary protein-induced proctitis and proctocolitis, food protein-induced enterocolitis syndrome, celiac disease, and food-induced pulmonary hemosiderosis.