Respiratory Tract InfectionsMetapneumovirusAcute DiseaseHuman bocavirusParamyxoviridae InfectionsNasopharynxIsatisPenicillin VUrinary Tract InfectionsPicornaviridae InfectionsRhinovirusRespiratory Syncytial Virus InfectionsAnti-Bacterial AgentsRespiratory Syncytial VirusesRespiratory Syncytial Virus, HumanDrug UtilizationSeasonsPhysician's Practice PatternsInfant, NewbornPhylogenyParvoviridae InfectionsChinaPolymerase Chain ReactionPrevalenceVirus DiseasesRespiratory SystemIncidenceSequence Analysis, DNADrug PrescriptionsMoraxella (Branhamella) catarrhalisCommon ColdFamily PracticeBronchitisRespiratory Tract DiseasesCommunity-Acquired InfectionsBacterial InfectionsHospitalizationHaemophilus influenzaePneumoniaBronchiolitisStreptococcus pneumoniaeOtitis MediaPneumonia, ViralPharyngitisTonsillitisProspective StudiesCoughHaemophilus InfectionsReproductive Tract InfectionsPneumonia, BacterialBocavirusNeisseriaceae InfectionsAmoxicillin-Potassium Clavulanate CombinationAnti-Infective AgentsReverse Transcriptase Polymerase Chain ReactionParvovirinaeAnti-Infective Agents, UrinaryUrinary TractRespiratory SoundsSinusitisMycoplasma pneumoniaeLungDiagnostic Test ApprovalMolecular Sequence DataChild WelfareMacrolidesMicrobial Sensitivity TestsVirusesVesico-Ureteral RefluxPneumococcal InfectionsRespiratory Tract NeoplasmsBacteriuriaBronchopneumoniaNasal MucosaMoraxellaceae InfectionsDisabled ChildrenSputumUrinary CatheterizationDrug Resistance, BacterialPneumonia, MycoplasmaEscherichia coli InfectionsBronchiolitis, ViralChild BehaviorRetrospective StudiesRisk FactorsBodily SecretionsPyelonephritisFluoroquinolonesAzithromycinAsthmaChlamydophila pneumoniaeFeverTracheaBordetella InfectionsUrineNoseAge FactorsRespirovirus InfectionsDrug Resistance, MicrobialTreatment Outcome