Pneumonia, MycoplasmaMycoplasma pneumoniaePneumonia, BacterialKlebsiella pneumoniaePneumonia, PneumococcalPneumoniaStreptococcus pneumoniaeKlebsiella InfectionsCommunity-Acquired InfectionsAnti-Bacterial AgentsBronchial DiseasesChlamydophila pneumoniaeAzithromycinPneumonia, ViralLungMacrolidesMinocyclineHaemophilus InfectionsLymphatic DiseasesCryptogenic Organizing PneumoniaHaemophilus influenzaeAntibodies, BacterialPneumococcal InfectionsPneumonia, PneumocystisPneumonia, StaphylococcalChlamydophila InfectionsSensitivity and SpecificityPneumonia, Ventilator-AssociatedPneumonia, AspirationMicrobial Sensitivity TestsTomography, X-Ray ComputedRetrospective StudiesNasopharynxInfant, NewbornBacterial ProteinsPneumonia, LipidDrug Resistance, BacterialTreatment OutcomeAnti-Infective AgentsRespiratory Tract InfectionsDNA, Bacterialbeta-LactamasesPenicillin ResistanceChlamydia InfectionsPediatricsProspective StudiesSerotypingLung Diseases, InterstitialCross InfectionPneumococcal VaccinesStreptolysinsPolymerase Chain ReactionBacteremiaHospitals, PediatricMeningitis, PneumococcalFluoroquinolonesChild, HospitalizedCephalosporinsErythromycinIntensive Care Units, PediatricBacterial CapsulesCefotaximePenicillinsCeftriaxoneIdiopathic Interstitial PneumoniasTime FactorsRisk FactorsDrug Resistance, MicrobialAcute DiseaseAge FactorsBronchoalveolar Lavage FluidDrug Resistance, Multiple, BacterialRespiration, ArtificialMolecular Sequence DataMycoplasmaHospitalizationOtitis MediaGenes, BacterialSeverity of Illness IndexIncidenceImmunocompromised HostCarbapenemsTrimethoprim-Sulfamethoxazole CombinationMurine pneumonia virusbeta-Lactam ResistanceLegionnaires' DiseasePneumocystis jiroveciiSepsisLevofloxacinBurnsFollow-Up StudiesColony Count, MicrobialOfloxacinPneumocystisAntigens, BacterialSequence Analysis, DNAKetolidesbeta-LactamsCohort StudiesBacteria