AnaphylaxisPassive Cutaneous AnaphylaxisEmergenciesEmergency Service, HospitalEmergency MedicineEmergency Medical ServicesEmergency TreatmentFood HypersensitivityImmunoglobulin EEmergency NursingDrug HypersensitivityInsect Bites and StingsWheat HypersensitivitySRS-APeanut HypersensitivityMast CellsSkin TestsHistamine ReleaseUrticariaEmergency Services, PsychiatricAllergensRetrospective StudiesHistamineDelayed DiagnosisBasophilsEarly DiagnosisEmergency Medical TechniciansEpinephrineAnti-Allergic AgentsBronchial SpasmSensitivity and SpecificityCell DegranulationAnt VenomsPrenatal DiagnosisDesensitization, ImmunologicHistamine H1 AntagonistsEmergency Medical Service Communication SystemsHypersensitivityCromolyn SodiumLatex HypersensitivityTriageTime FactorsGlafenineProspective StudiesHistamine AntagonistsAutacoidsAngioedemaDiagnosisHypersensitivity, ImmediateArachis hypogaeaDiagnostic ErrorsContraceptives, PostcoitalContraception, PostcoitalOvalbuminLens PlantBee VenomsAmbulancesTreatment OutcomeAdrenergic AgonistsAntigens, PlantIntradermal TestsTomography, X-Ray ComputedNeuromuscular Blocking AgentsAscarisGuinea PigsWounds and InjuriesRisk FactorsArthropod VenomsTryptasesNut HypersensitivityReaginsReceptors, IgEImmunoglobulin GDisaster PlanningPatient AdmissionPredictive Value of TestsInfant, NewbornAcute DiseaseDiethylcarbamazineIncidenceUnited StatesAntigensPlatelet Activating FactorHymenopteraSeverity of Illness Indexp-Methoxy-N-methylphenethylamineFirst AidBasophil Degranulation TestEvidence-Based Emergency MedicineMastocytosisFagopyrumFatal OutcomeMethysergideBites and StingsEmergency RespondersFollow-Up StudiesHospitalization