BronchiolitisBronchiolitis, ViralBronchiolitis ObliteransCryptogenic Organizing PneumoniaLung TransplantationRespiratory Syncytial Virus InfectionsRacepinephrineRespiratory Syncytial VirusesRespiratory Syncytial Virus, HumanBronchopneumoniaRespiratory SoundsRespirovirus InfectionsLungFlavoring AgentsCollagen Type VInfant, NewbornAcute DiseaseTransplantation, HeterotopicBronchodilator AgentsRespiratory Function TestsHeart-Lung TransplantationMetapneumovirusBronchoalveolar Lavage FluidNebulizers and VaporizersHospitalizationCroupGraft RejectionPneumonia, ViralRespiratory AspirationOxygen Inhalation TherapyParamyxoviridae InfectionsBronchitisHeliumRespiratory Tract InfectionsBronchiTracheaLung DiseasesNasopharynxSaline Solution, HypertonicGuadeloupeAirway ObstructionAdministration, InhalationBiopsyBronchiolesLung Diseases, InterstitialAlbuterolBronchoalveolar LavageRespiratory RateNasal Lavage FluidMediastinal EmphysemaSeverity of Illness IndexAzithromycinAdenoviridae InfectionsAsthmaTransplantation, HomologousRespiratory TherapyIntensive Care Units, PediatricPneumoniaFollow-Up StudiesHospitals, PediatricFood-Processing IndustryPrednisoloneRetrospective StudiesRadiography, ThoracicLength of StayMurine pneumonia virusChild, HospitalizedGlucocorticoidsRespiration, ArtificialPulmonary FibrosisEosinophil Cationic ProteinProspective StudiesForced Expiratory Volume