Otitis MediaOtitis Media with EffusionMiddle Ear VentilationTympanic MembraneMyringoplastyOtoscopyOtitis Media, SuppurativeEar, MiddleOtitis ExternaAcute DiseaseEustachian TubeNasopharynxHaemophilus influenzaeStreptococcus pneumoniaePneumococcal InfectionsChinchillaAmoxicillin-Potassium Clavulanate CombinationMoraxella (Branhamella) catarrhalisOtitisMoraxellaceae InfectionsHaemophilus InfectionsOtolaryngologyAmoxicillinMastoiditisTympanic Membrane PerforationPneumococcal VaccinesAcoustic Impedance TestsOtoscopesLabyrinthitisRespiratory Tract InfectionsAnti-Bacterial AgentsEaracheCefaclorChild Day Care CentersXylitolAzithromycinVaccines, ConjugateCulture MediaSulfisoxazoleHuman bocavirusDiagnostic Techniques, OtologicalRecurrenceCefuroximeMicrobial InteractionsSinusitisExudates and TransudatesNeisseriaceae InfectionsNasopharyngeal DiseasesSchools, NurseryAcademies and InstitutesPenicillinsAdenoidectomyStreptolysinsClavulanic AcidCarrier StateSerotypingMetapneumovirusProspective StudiesNasal Lavage FluidBacterial InfectionsPenicillin ResistanceNasopharyngitisLabyrinthine FluidsClavulanic AcidsCholesteatoma, Middle EarMeningococcal VaccinesInfant, NewbornIncusRound Window, EarAntibodies, BacterialCephalosporinsVirus DiseasesNetherlandsTympanoplastyParental NotificationEar DiseasesDouble-Blind MethodTreatment OutcomeHaemophilus VaccinesDrug UtilizationAdenoidsMastoidMicrobial Sensitivity TestsDrug Therapy, CombinationGerbillinaeHearing LossIsraelCoinfectionDisease Models, AnimalCeftriaxoneBacterial ProteinsEar CanalPharyngitisFeverBacterial CapsulesVirusesPediatricsCohort StudiesMultilocus Sequence TypingTime Factors