PneumoniaPneumonia, BacterialPneumonia, ViralPneumonia, PneumococcalCryptogenic Organizing PneumoniaPneumonia, PneumocystisPneumonia, StaphylococcalPneumonia, Ventilator-AssociatedPneumonia, AspirationCommunity-Acquired InfectionsPneumonia, MycoplasmaPneumonia, LipidLung Diseases, InterstitialLungIdiopathic Interstitial PneumoniasAnti-Bacterial AgentsStreptococcus pneumoniaeMurine pneumonia virusPneumocystis jiroveciiPneumocystisBronchoalveolar Lavage FluidLegionnaires' DiseaseRadiography, ThoracicMycoplasma pneumoniaeCross InfectionPulmonary EosinophiliaTrimethoprim-Sulfamethoxazole CombinationBronchopneumoniaHospitalizationPneumonia, Progressive Interstitial, of SheepRespiration, ArtificialVentilators, MechanicalBronchoalveolar LavageRetrospective StudiesIntensive Care UnitsProspective StudiesFatal OutcomeTreatment OutcomeAnti-Infective AgentsPseudomonas InfectionsPneumonia of Swine, MycoplasmalPneumococcal VaccinesTime FactorsDisease Models, AnimalPneumocystis cariniiEmpyemaLegionella pneumophilaRisk FactorsSeverity of Illness IndexImmunocompromised HostPneumococcal InfectionsInfluenza, HumanLegionellaBacteremiaPentamidineChild, HospitalizedBronchoscopyAIDS-Related Opportunistic InfectionsChlamydial PneumoniaRespiratory Tract InfectionsPasteurellosis, PneumonicPulmonary FibrosisSputumIncidenceKlebsiella InfectionsAcute DiseasePseudomonas aeruginosaKlebsiella pneumoniaeOpportunistic InfectionsLung DiseasesHaemophilus InfectionsInfant, NewbornPneumocystis InfectionsTomography, X-Ray ComputedPneumovirus InfectionsMice, Inbred C57BLSpecies SpecificityMolecular Sequence DataSepsisLung AbscessCohort StudiesSensitivity and SpecificityPasteurella InfectionsLength of StayChlamydophila pneumoniaePolymerase Chain ReactionRespiratory InsufficiencyInfluenza A Virus, H1N1 SubtypePulmonary AlveoliIdiopathic Pulmonary FibrosisNasopharynxPneumonia, RickettsialConfusionDisease OutbreaksAntibodies, BacterialMycoplasma InfectionsMicrobial Sensitivity TestsMacrophages, AlveolarPleural EffusionColony Count, Microbial