Pneumonia, PneumococcalPneumoniaPneumonia, BacterialStreptococcus pneumoniaePneumonia, ViralCommunity-Acquired InfectionsCryptogenic Organizing PneumoniaStreptolysinsPneumonia, PneumocystisLungPneumonia, StaphylococcalPneumococcal VaccinesPneumonia, MycoplasmaPneumonia, Ventilator-AssociatedBacteremiaPneumonia, AspirationPneumococcal InfectionsCeftriaxoneAnti-Bacterial AgentsBronchoalveolar Lavage FluidPneumonia, LipidRadiography, ThoracicEmpyemaInterleukin-27Community Health ServicesColony Count, MicrobialLegionnaires' DiseaseLung Diseases, InterstitialSputumPenicillin ResistanceHospitalizationMacrolidesCephalosporin ResistanceMacrophages, AlveolarCoagulation Protein DisordersPsittacosisCounterimmunoelectrophoresisPenicillinsNasopharynxHospitals, CommunityAntigens, BacterialProspective StudiesDisease Models, AnimalDisease SusceptibilityPenicillin GPolysaccharides, BacterialCefotaximeBacterial LoadIdiopathic Interstitial PneumoniasVaccines, ConjugateOrthomyxoviridae InfectionsCommunity NetworksMice, Inbred C57BLSensitivity and SpecificityInfluenza, HumanConvalescenceSerotypingRetrospective StudiesCytokinesIncidenceAnti-Infective AgentsAmoxicillinAntibodies, BacterialNeutrophilsSeverity of Illness IndexLatex Fixation TestsRisk FactorsTime FactorsMicrobial Sensitivity TestsSepsisOfloxacinTreatment OutcomeMurine pneumonia virusCommunity Health WorkersCoinfectionCommunity Health PlanningPneumocystis jiroveciiMeningitis, PneumococcalNeutrophil InfiltrationBacterial ProteinsBloodUnited StatesPneumocystisImmunity, InnateBacteriaChemokine CXCL2LevofloxacinCross InfectionCephalosporinsMycoplasma pneumoniaeMice, Inbred BALB CBacterial VaccinesEcosystemMice, KnockoutVaccinationPhagocytosis