Pneumonia, PneumococcalPneumoniaPneumonia, BacterialStreptococcus pneumoniaePneumonia, ViralCommunity-Acquired InfectionsCryptogenic Organizing PneumoniaStreptolysinsPneumonia, PneumocystisLungPneumonia, StaphylococcalPneumococcal VaccinesBacteremiaPneumonia, MycoplasmaPneumonia, Ventilator-AssociatedAnti-Bacterial AgentsPneumonia, AspirationPneumococcal InfectionsCeftriaxoneBronchoalveolar Lavage FluidMicrobial Sensitivity TestsPneumonia, LipidRadiography, ThoracicEmpyemaSerotypingPenicillin ResistanceInterleukin-27Colony Count, MicrobialMacrolidesLegionnaires' DiseaseCephalosporin ResistanceSputumLung Diseases, InterstitialPenicillinsBacterial ProteinsMacrophages, AlveolarCoagulation Protein DisordersPsittacosisHospitalizationAntigens, BacterialDrug Resistance, BacterialCounterimmunoelectrophoresisNasopharynxAnti-Infective AgentsCefotaximePenicillin GDisease Models, AnimalPolysaccharides, BacterialDisease SusceptibilitySensitivity and SpecificityOrthomyxoviridae InfectionsVaccines, ConjugatePolymerase Chain ReactionIdiopathic Interstitial PneumoniasMice, Inbred C57BLBacterial LoadDNA, BacterialOfloxacinCross InfectionProspective StudiesConvalescenceBloodAntibodies, BacterialInfluenza, HumanAmoxicillinCytokinesLatex Fixation TestsCephalosporinsSepsisBacterial Typing TechniquesNeutrophilsLevofloxacinRetrospective StudiesFluoroquinolonesMeningitis, PneumococcalSequence Analysis, DNATime FactorsMurine pneumonia virusCoinfectionPneumocystis jiroveciiNeutrophil InfiltrationSeverity of Illness IndexPhylogenyPneumocystisMolecular Sequence DataIncidenceImmunity, InnateChemokine CXCL2Treatment OutcomeMice, Inbred BALB CSpainBacterial VaccinesMycoplasma pneumoniaeTrimethoprim-Sulfamethoxazole CombinationElectrophoresis, Gel, Pulsed-FieldPhagocytosisUrineMice, KnockoutRisk Factors