PneumoniaPneumonia, BacterialPneumonia, ViralPneumonia, PneumococcalCryptogenic Organizing PneumoniaPneumonia, PneumocystisPneumonia, StaphylococcalPneumonia, Ventilator-AssociatedPneumonia, AspirationCommunity-Acquired InfectionsPneumonia, MycoplasmaPneumonia, LipidLung Diseases, InterstitialLungIdiopathic Interstitial PneumoniasStreptococcus pneumoniaeAnti-Bacterial AgentsMurine pneumonia virusPneumocystis jiroveciiPneumocystisLegionnaires' DiseaseBronchoalveolar Lavage FluidRadiography, ThoracicMycoplasma pneumoniaeCross InfectionPulmonary EosinophiliaTrimethoprim-Sulfamethoxazole CombinationBronchopneumoniaHospitalizationPneumonia, Progressive Interstitial, of SheepVentilators, MechanicalBronchoalveolar LavageRespiration, ArtificialIntensive Care UnitsRetrospective StudiesProspective StudiesFatal OutcomePneumonia of Swine, MycoplasmalPseudomonas InfectionsPneumococcal VaccinesTreatment OutcomeAnti-Infective AgentsPneumocystis cariniiEmpyemaLegionella pneumophilaSeverity of Illness IndexInfluenza, HumanRisk FactorsLegionellaPneumococcal InfectionsChild, HospitalizedImmunocompromised HostPentamidineChlamydial PneumoniaBronchoscopyBacteremiaAIDS-Related Opportunistic InfectionsPasteurellosis, PneumonicRespiratory Tract InfectionsPulmonary FibrosisSputumKlebsiella InfectionsIncidenceKlebsiella pneumoniaePseudomonas aeruginosaHaemophilus InfectionsOpportunistic InfectionsAcute DiseaseLung DiseasesPneumovirus InfectionsPneumocystis InfectionsLung AbscessTomography, X-Ray ComputedTime FactorsInfant, NewbornLength of StayPasteurella InfectionsSepsisRespiratory InsufficiencyChlamydophila pneumoniaeIdiopathic Pulmonary FibrosisCohort StudiesPneumonia, RickettsialConfusionDisease Models, AnimalNasopharynxPulmonary AlveoliPleural EffusionMycoplasma InfectionsMineral OilSensitivity and SpecificityMacrophages, AlveolarInfluenza A Virus, H1N1 SubtypeHospital MortalityLung Diseases, FungalCeftriaxoneIntubation, IntratrachealIntensive CareMacrolidesDeglutition Disorders