PneumoniaPneumonia, BacterialPneumonia, ViralPneumonia, PneumococcalCryptogenic Organizing PneumoniaPneumonia, PneumocystisPneumonia, StaphylococcalPneumonia, Ventilator-AssociatedPneumonia, AspirationCommunity-Acquired InfectionsPneumonia, MycoplasmaPneumonia, LipidLung Diseases, InterstitialLungIdiopathic Interstitial PneumoniasAnti-Bacterial AgentsStreptococcus pneumoniaeMurine pneumonia virusPneumocystis jiroveciiPneumocystisRadiography, ThoracicLegionnaires' DiseaseBronchoalveolar Lavage FluidMycoplasma pneumoniaeSeverity of Illness IndexTreatment OutcomeProspective StudiesCross InfectionRetrospective StudiesPulmonary EosinophiliaHospitalizationTrimethoprim-Sulfamethoxazole CombinationBronchopneumoniaRisk FactorsPneumonia, Progressive Interstitial, of SheepRespiration, ArtificialVentilators, MechanicalBronchoalveolar LavageIntensive Care UnitsFatal OutcomeTime FactorsPneumonia of Swine, MycoplasmalPseudomonas InfectionsPneumococcal VaccinesAnti-Infective AgentsEmpyemaPneumocystis cariniiInfluenza, HumanLegionella pneumophilaRespiratory Tract InfectionsIncidenceAcute DiseaseBronchoscopySymptom AssessmentImmunocompromised HostChild, HospitalizedLegionellaPneumococcal InfectionsDepressionAIDS-Related Opportunistic InfectionsCohort StudiesSputumBacteremiaTomography, X-Ray ComputedPentamidineChlamydial PneumoniaPasteurellosis, PneumonicPulmonary FibrosisFollow-Up StudiesLung DiseasesKlebsiella InfectionsInfant, NewbornQuestionnairesComorbidityOpportunistic InfectionsKlebsiella pneumoniaePseudomonas aeruginosaSensitivity and SpecificityCoughHaemophilus InfectionsPrevalenceAge FactorsDisease Models, AnimalConfusionLength of StayPneumocystis InfectionsUnited StatesPneumovirus InfectionsLung AbscessDeglutition DisordersRespiratory InsufficiencySepsisPrognosisAdrenal Cortex HormonesPasteurella InfectionsPredictive Value of TestsChlamydophila pneumoniaeDrug Therapy, CombinationNasopharynxIdiopathic Pulmonary Fibrosis