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 SheepFatal OutcomeRespiration, ArtificialVentilators, MechanicalBronchoalveolar LavageRetrospective StudiesIntensive Care UnitsProspective StudiesTreatment OutcomePneumonia of Swine, MycoplasmalPseudomonas InfectionsAnti-Infective AgentsPneumococcal VaccinesPneumocystis cariniiEmpyemaRaccoon DogsLegionella pneumophilaSeverity of Illness IndexRisk FactorsInfluenza, HumanImmunocompromised HostLegionellaTime FactorsPneumococcal InfectionsChild, HospitalizedBronchoscopyPentamidineChlamydial PneumoniaBacteremiaAIDS-Related Opportunistic InfectionsRespiratory Tract InfectionsPasteurellosis, PneumonicPulmonary FibrosisSputumDisease Models, AnimalIncidenceKlebsiella InfectionsAcute DiseaseKlebsiella pneumoniaePseudomonas aeruginosaOpportunistic InfectionsHaemophilus InfectionsLung DiseasesPneumovirus InfectionsTomography, X-Ray ComputedPneumocystis InfectionsLung AbscessInfant, NewbornPasteurella InfectionsLength of StaySepsisRespiratory InsufficiencySensitivity and SpecificityPulmonary AlveoliChlamydophila pneumoniaeCohort StudiesIdiopathic Pulmonary FibrosisConfusionPneumonia, RickettsialMycoplasma InfectionsNasopharynxPleural EffusionMacrolidesMineral OilMacrophages, AlveolarInfluenza A Virus, H1N1 SubtypeIntubation, IntratrachealHospital MortalityLung Diseases, FungalCeftriaxoneAntibodies, Bacterial