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 InfectionHospitalizationTrimethoprim-Sulfamethoxazole CombinationPulmonary EosinophiliaBronchopneumoniaProspective StudiesRetrospective StudiesPneumonia, Progressive Interstitial, of SheepRisk FactorsVentilators, MechanicalBronchoalveolar LavageRespiration, ArtificialIntensive Care UnitsTreatment OutcomePneumococcal VaccinesFatal OutcomeSeverity of Illness IndexIncidencePneumonia of Swine, MycoplasmalPseudomonas InfectionsAnti-Infective AgentsInfluenza, HumanDisabled PersonsPneumocystis cariniiEmpyemaAIDS-Related Opportunistic InfectionsLegionella pneumophilaUnited StatesPneumococcal InfectionsImmunocompromised HostLegionellaChild, HospitalizedRespiratory Tract InfectionsBacteremiaPentamidineChlamydial PneumoniaBronchoscopyPasteurellosis, PneumonicCohort StudiesSputumPulmonary FibrosisTime FactorsKlebsiella InfectionsAcute DiseaseInfant, NewbornOpportunistic InfectionsKlebsiella pneumoniaeHaemophilus InfectionsPseudomonas aeruginosaLung DiseasesAge FactorsDisease OutbreaksPneumocystis InfectionsLength of StayPneumovirus InfectionsTomography, X-Ray ComputedLung AbscessSensitivity and SpecificityHIV InfectionsSepsisPasteurella InfectionsRespiratory InsufficiencyChlamydophila pneumoniaeConfusionIdiopathic Pulmonary FibrosisComorbidityInfluenza A Virus, H1N1 SubtypeDisease Models, AnimalPneumonia, RickettsialNasopharynxMycoplasma InfectionsPopulation SurveillancePulmonary AlveoliPleural EffusionMacrophages, AlveolarHospital Mortality