PneumoniaCommunity-Acquired InfectionsPneumonia, BacterialSeverity of Illness IndexConfusionPneumonia, ViralHospitalizationPneumonia, PneumococcalProspective StudiesAnti-Bacterial AgentsIntensive Care UnitsCryptogenic Organizing PneumoniaRetrospective StudiesPrognosisPneumonia, PneumocystisEmergency Service, HospitalHospital MortalityPneumonia, StaphylococcalROC CurveLength of StayTreatment OutcomeCohort StudiesPneumonia, Ventilator-AssociatedPneumonia, AspirationRisk FactorsPneumonia, MycoplasmaPneumonia, LipidLung Diseases, InterstitialLungIdiopathic Interstitial PneumoniasStreptococcus pneumoniaeMurine pneumonia virusPneumocystis jiroveciiBronchoalveolar Lavage FluidPneumocystisLegionnaires' DiseaseRadiography, ThoracicCross InfectionMycoplasma pneumoniaeInjury Severity ScorePulmonary EosinophiliaTrimethoprim-Sulfamethoxazole CombinationRespiration, ArtificialTime FactorsBronchopneumoniaBronchoalveolar LavagePneumonia, Progressive Interstitial, of SheepAcute DiseaseVentilators, MechanicalTrauma Severity IndicesDisease Models, AnimalIncidencePseudomonas InfectionsFatal OutcomePneumonia of Swine, MycoplasmalInfluenza, HumanAnti-Infective AgentsPneumococcal VaccinesInfant, NewbornPredictive Value of TestsPneumocystis cariniiRespiratory Tract InfectionsBiological MarkersEmpyemaChild, HospitalizedCase-Control StudiesBacteremiaSensitivity and SpecificityLegionella pneumophilaAge FactorsTomography, X-Ray ComputedImmunocompromised HostComorbiditySputumFollow-Up StudiesPulmonary Fibrosis