Respiratory Tract InfectionsOtitis MediaEchinaceaCommon ColdPharyngitisRhinovirusOxidants, PhotochemicalVirus DiseasesBronchitisDrug UtilizationNasopharynxPhysician's Practice PatternsAcute DiseaseAnti-Bacterial AgentsParamyxoviridae InfectionsUpper ExtremityMetapneumovirusRespiratory Syncytial Virus InfectionsInfant, NewbornVirusesSeasonsPicornaviridae InfectionsPneumonia, MycoplasmaMycoplasma pneumoniaeNasal Lavage FluidRespiratory Syncytial VirusesRespiratory Syncytial Virus, HumanInfluenza, HumanHuman bocavirusAdenoviridae Infections