PneumoniaPneumonia, BacterialPneumonia, ViralPneumonia, PneumococcalCryptogenic Organizing PneumoniaPneumonia, PneumocystisPneumonia, StaphylococcalImmune SystemPneumonia, Ventilator-AssociatedPneumonia, AspirationCommunity-Acquired InfectionsPneumonia, MycoplasmaPneumonia, LipidImmune ToleranceLung Diseases, InterstitialLungImmunity, InnateIdiopathic Interstitial PneumoniasStreptococcus pneumoniaeAnti-Bacterial AgentsMice, Inbred C57BLImmune EvasionCytokinesMice, Inbred BALB CMurine pneumonia virusBronchoalveolar Lavage FluidPneumocystis jiroveciiPneumocystisImmune SeraAntigen-Antibody ComplexImmunity, CellularT-LymphocytesLegionnaires' DiseaseImmunoglobulin GImmunityRadiography, ThoracicMycoplasma pneumoniaeCross InfectionLymphocyte ActivationAntibody FormationPulmonary EosinophiliaImmune Complex DiseasesImmune System DiseasesTrimethoprim-Sulfamethoxazole CombinationDisease Models, AnimalSpleenBronchopneumoniaInterferon-gammaHospitalizationBronchoalveolar LavagePneumonia, Progressive Interstitial, of SheepDendritic CellsProspective StudiesTime FactorsCD4-Positive T-LymphocytesRetrospective StudiesVentilators, MechanicalRespiration, ArtificialTreatment OutcomeAdaptive ImmunityIntensive Care UnitsAntibodies, BacterialEnzyme-Linked Immunosorbent AssayPseudomonas InfectionsPneumococcal VaccinesMacrophagesMice, KnockoutImmunocompromised HostFatal OutcomeAnti-Infective AgentsImmunizationPneumonia of Swine, MycoplasmalInfluenza, HumanImmune System ProcessesCells, CulturedSeverity of Illness IndexPneumocystis cariniiInflammationAdjuvants, ImmunologicRisk FactorsAntibodies, ViralLegionella pneumophilaAIDS-Related Opportunistic InfectionsVaccinationEmpyemaPneumococcal InfectionsRespiratory Tract InfectionsAcute DiseaseB-LymphocytesFlow CytometryAntigens, BacterialImmunity, HumoralLymphocytesBacteremiaLegionellaNeutrophilsMolecular Sequence DataChlamydial PneumoniaBronchoscopyPulmonary Fibrosis