Granuloma, Respiratory TractRespiratory Tract InfectionsGranulomaRespiratory SystemGranuloma, Foreign-BodyRespiratory Syncytial Virus InfectionsRespiratory Tract DiseasesRespiratory Syncytial VirusesGranuloma, PyogenicEosinophilic GranulomaParamyxoviridae InfectionsLungMetapneumovirusAnti-Bacterial AgentsNasopharynxGranuloma AnnulareRespiratory Tract NeoplasmsPneumonia, ViralBronchitisRespiratory Syncytial Virus, HumanBronchiolitisMoraxella (Branhamella) catarrhalisPneumoniaVirus DiseasesTracheaHaemophilus influenzaeGranuloma, Giant CellNasal MucosaUrinary Tract InfectionsPneumonia, BacterialBronchoalveolar Lavage FluidBocavirusStreptococcus pneumoniaeAcute DiseaseCommunity-Acquired InfectionsHuman bocavirusAerosolsPicornaviridae InfectionsNeisseriaceae InfectionsBronchiolitis, ViralBronchiParainfluenza Virus 3, HumanLung DiseasesGranuloma InguinaleBordetella InfectionsSputumRespiratory SoundsRhinovirusNasal CavityFerretsGastrointestinal TractRespirovirus InfectionsInfant, NewbornBacterial InfectionsBordetella bronchisepticaBodily SecretionsHaemophilus InfectionsUrinary TractPeriapical GranulomaCoughVirusesNoseCommon ColdOrthomyxoviridae InfectionsAdministration, IntranasalRespiratory Syncytial Virus VaccinesProspective StudiesGranuloma, LaryngealParvovirinaeSeasonsParvoviridae InfectionsNasal Lavage FluidInfluenza A virusParainfluenza Virus 2, HumanMycoplasma InfectionsMycoplasma pneumoniaeHospitalizationWegener GranulomatosisBronchopneumoniaPharynxInfluenza, HumanBordetella parapertussisPneumococcal InfectionsPneumonia, PneumococcalPyramidal TractsRespiratory MucosaMice, Inbred BALB C