BronchiolitisBronchiolitis, ViralBronchiolitis ObliteransCryptogenic Organizing PneumoniaLung TransplantationRespiratory Syncytial Virus InfectionsRacepinephrineRespiratory Syncytial VirusesRespiratory Syncytial Virus, HumanPlacebo EffectDouble-Blind MethodBronchopneumoniaRespiratory SoundsLungRespirovirus InfectionsFlavoring AgentsBronchodilator AgentsInfant, NewbornCollagen Type VAcute DiseaseRespiratory Function TestsTransplantation, HeterotopicNebulizers and VaporizersHeart-Lung TransplantationMetapneumovirusHospitalizationBronchoalveolar Lavage FluidCroupGraft RejectionPneumonia, ViralRespiratory AspirationOxygen Inhalation TherapyParamyxoviridae InfectionsBronchitisRespiratory Tract InfectionsHeliumBronchiTreatment OutcomeAdministration, InhalationAlbuterolSeverity of Illness IndexTracheaLung DiseasesNasopharynxFollow-Up StudiesAsthmaSaline Solution, HypertonicAirway ObstructionBiopsyGuadeloupeNasal Lavage FluidAzithromycinLung Diseases, InterstitialBronchiolesProspective StudiesBronchoalveolar LavageRespiratory RateMediastinal EmphysemaAdenoviridae InfectionsTransplantation, HomologousPrednisoloneGlucocorticoidsRespiratory TherapyPneumoniaIntensive Care Units, PediatricRetrospective StudiesLength of StayHospitals, PediatricFood-Processing IndustryRadiography, ThoracicMurine pneumonia virusRespiration, ArtificialAdrenal Cortex HormonesChild, HospitalizedPulmonary FibrosisTime FactorsCross-Over StudiesEosinophil Cationic ProteinTomography, X-Ray ComputedForced Expiratory Volume