Streptococcus pneumoniaePneumonia, BacterialPneumoniaStreptococcusPneumonia, PneumococcalPneumonia, ViralStreptococcus pyogenesStreptococcus mutansPneumonia, PneumocystisFeverPneumonia, StaphylococcalCommunity-Acquired InfectionsCryptogenic Organizing PneumoniaStreptococcus agalactiaeStreptococcal InfectionsPneumonia, Ventilator-AssociatedLungPneumonia, MycoplasmaAnti-Bacterial AgentsPneumonia, AspirationStreptococcus suisPneumococcal InfectionsStreptococcus bovisBronchoalveolar Lavage FluidStreptococcus mitisKlebsiella pneumoniaeKlebsiella InfectionsQ FeverStreptococcus equiTrimethoprim-Sulfamethoxazole CombinationStreptococcus oralisPneumonia, LipidAIDS-Related Opportunistic InfectionsStreptococcus sobrinusEmpiricismStreptococcus PhagesInfluenza, HumanBacterial ProteinsAnti-Infective AgentsStreptococcus gordoniiLung Diseases, InterstitialStreptococcus thermophilusYellow FeverCross InfectionTyphoid FeverOrthomyxoviridae InfectionsSuperinfectionProspective StudiesHaemophilus InfectionsMacrophages, AlveolarSerotypingBacterial LoadFever of Unknown OriginNeutrophilsCoinfectionHospitalizationRheumatic FeverStreptolysinsMicrobial Sensitivity TestsHaemophilus influenzaePulmonary Surfactant-Associated Protein DRetrospective StudiesIdiopathic Interstitial PneumoniasPseudomonas InfectionsMouthEnterococcus faecalisBronchoscopyRespiration, ArtificialDNA, BacterialAcute DiseaseAntigens, BacterialLung DiseasesBacterial InfectionsBacteriaIncidenceSputumErythromycinRisk FactorsPharyngitisPneumococcal VaccinesTreatment OutcomeInfluenza A Virus, H1N1 SubtypeHIV InfectionsDisease Models, AnimalDisease OutbreaksMurine pneumonia virusPseudomonas aeruginosaStaphylococcus aureusPneumocystis jiroveciiPenicillinsTime FactorsAntibodies, BacterialNasopharynxMice, Inbred C57BLDental PlaqueBacteremiaLung Diseases, FungalPneumocystisPenicillin ResistanceStreptococcus intermedius