Pneumonia, PneumococcalPneumoniaPneumonia, BacterialStreptococcus pneumoniaePneumonia, ViralCommunity-Acquired InfectionsCryptogenic Organizing PneumoniaStreptolysinsPneumonia, PneumocystisLungPneumonia, StaphylococcalSeverity of Illness IndexPneumococcal VaccinesPneumonia, MycoplasmaPneumonia, Ventilator-AssociatedBacteremiaPneumonia, AspirationPneumococcal InfectionsCeftriaxoneAnti-Bacterial AgentsBronchoalveolar Lavage FluidPneumonia, LipidRadiography, ThoracicEmpyemaInterleukin-27Lung Diseases, InterstitialLegionnaires' DiseaseSputumColony Count, MicrobialHospitalizationPenicillin ResistanceMacrolidesCephalosporin ResistanceMacrophages, AlveolarCoagulation Protein DisordersPsittacosisDisease Models, AnimalCounterimmunoelectrophoresisProspective StudiesPenicillinsDisease SusceptibilityNasopharynxAntigens, BacterialMice, Inbred C57BLPenicillin GPolysaccharides, BacterialIdiopathic Interstitial PneumoniasSensitivity and SpecificityOrthomyxoviridae InfectionsCefotaximeRetrospective StudiesVaccines, ConjugateCytokinesBacterial LoadConvalescenceInfluenza, HumanSerotypingTreatment OutcomeNeutrophilsSepsisTime FactorsAntibodies, BacterialAnti-Infective AgentsAmoxicillinLatex Fixation TestsOfloxacinIncidenceMurine pneumonia virusNeutrophil InfiltrationMeningitis, PneumococcalCoinfectionPneumocystis jiroveciiMicrobial Sensitivity TestsBloodImmunity, InnateRisk FactorsPneumocystisChemokine CXCL2Bacterial ProteinsLevofloxacinMice, Inbred BALB CMice, KnockoutCephalosporinsMycoplasma pneumoniaeCross InfectionBacterial VaccinesPhagocytosis