CoughPneumoniaPneumonia, BacterialPneumonia, ViralPneumonia, PneumococcalCryptogenic Organizing PneumoniaPneumonia, PneumocystisWhooping CoughPneumonia, StaphylococcalAntitussive AgentsPneumonia, AspirationPneumonia, Ventilator-AssociatedPneumonia, MycoplasmaCommunity-Acquired InfectionsPneumonia, LipidLung Diseases, InterstitialLungAnti-Bacterial AgentsIdiopathic Interstitial PneumoniasRadiography, ThoracicStreptococcus pneumoniaePneumocystis jiroveciiMurine pneumonia virusBronchoalveolar Lavage FluidCapsaicinMycoplasma pneumoniaePneumocystisLegionnaires' DiseaseRespiratory Tract InfectionsSputumPulmonary EosinophiliaCitric AcidCross InfectionBronchitisCodeineBronchopneumoniaProspective StudiesBronchoscopyRespiratory SoundsTrimethoprim-Sulfamethoxazole CombinationBronchoalveolar LavageHospitalizationTreatment OutcomeRetrospective StudiesReflexRespiration, ArtificialFatal OutcomePneumonia, Progressive Interstitial, of SheepVentilators, MechanicalSeverity of Illness IndexExpectorantsIntensive Care UnitsChronic DiseaseInfluenza, HumanAdministration, InhalationRespiratory Tract DiseasesLung DiseasesRisk FactorsAsthmaPneumonia of Swine, MycoplasmalAnti-Infective AgentsAcute DiseasePseudomonas InfectionsPneumococcal VaccinesRespiratory Function TestsAerosolsPneumocystis cariniiEmpyemaIncidenceTime FactorsImmunocompromised HostLegionella pneumophilaRespiration DisordersTomography, X-Ray ComputedBordetella pertussisPulmonary FibrosisCommon ColdAIDS-Related Opportunistic InfectionsRespiratory AspirationRespiratory SystemBacteremiaLegionellaPneumococcal InfectionsChild, HospitalizedPentamidineChlamydial PneumoniaInfant, NewbornNasal DecongestantsBronchial DiseasesDeglutition DisordersPasteurellosis, PneumonicForced Expiratory VolumeBronchial Provocation TestsLung AbscessVital CapacityOpportunistic InfectionsRespiratory InsufficiencyGastroesophageal RefluxGuaifenesinCohort Studies