AsthmaInhalation SpacersAcute DiseaseEmergency Service, HospitalAnti-Asthmatic AgentsSesterterpenesPeak Expiratory Flow RatePicornaviridae InfectionsBronchodilator AgentsAdministration, InhalationStatus AsthmaticusAdrenal Cortex HormonesAlbuterolRhinovirusForced Expiratory VolumeNebulizers and VaporizersBudesonideAdrenergic beta-AgonistsRespiratory Function TestsSpirometryNasal LavageLeukotriene AntagonistsSputumRespiratory SoundsPulmonary Disease, Chronic ObstructiveGlucocorticoidsBronchial HyperreactivityHospitalizationBronchitisDouble-Blind MethodAllergensAminophyllineAtypical Bacterial FormsEosinophilsRespiratory Tract InfectionsTreatment OutcomeLungVariola virusProspective StudiesInterleukin-4 Receptor alpha SubunitAsthma, Exercise-InducedMetered Dose InhalersIpratropiumBeclomethasoneHypersensitivityCommon ColdEmergenciesPrednisoloneEthanolaminesRespiratory Care UnitsNedocromilBronchiBreath TestsVirus DiseasesMagnesium SulfateAndrostadienesDrug Therapy, CombinationAirway RemodelingDisease ProgressionAsthma, OccupationalAnti-Inflammatory AgentsAdministration, OralAirway ObstructionDrug Administration ScheduleSelf CareQuestionnairesBronchoconstrictionRetrospective StudiesAdrenergic beta-2 Receptor AgonistsPractice Guidelines as TopicTachypneaLeukotriene E4PneumovirusRecurrenceRisk FactorsTime FactorsAir PollutantsFollow-Up StudiesFenoterolEnvironmental ExposureMucusCohort StudiesRespiratory SystemHypersensitivity, ImmediateNitrogen DioxideLightningParamyxoviridae InfectionsRhinitisQuinolinesMethacholine ChlorideQuality of LifeVital CapacityInflammationBronchitis, ChronicRhinitis, Allergic, PerennialChronic DiseaseOzoneMethylprednisolone HemisuccinateAerosolsVehicle Emissions