Streptococcus pneumoniaePneumonia, BacterialPneumoniaStreptococcusPneumonia, PneumococcalPneumonia, ViralStreptococcus pyogenesStreptococcus mutansPneumonia, PneumocystisPneumonia, StaphylococcalCommunity-Acquired InfectionsCryptogenic Organizing PneumoniaStreptococcus agalactiaeStreptococcal InfectionsPneumonia, Ventilator-AssociatedLungPneumonia, MycoplasmaAnti-Bacterial AgentsPneumonia, AspirationStreptococcus suisPneumococcal InfectionsStreptococcus bovisBronchoalveolar Lavage FluidStreptococcus mitisKlebsiella pneumoniaeKlebsiella InfectionsStreptococcus equiTrimethoprim-Sulfamethoxazole CombinationStreptococcus oralisPneumonia, LipidStreptococcus sobrinusAIDS-Related Opportunistic InfectionsEmpiricismStreptococcus PhagesInfluenza, HumanBacterial ProteinsAnti-Infective AgentsStreptococcus gordoniiLung Diseases, InterstitialStreptococcus thermophilusCross InfectionOrthomyxoviridae InfectionsSuperinfectionHaemophilus InfectionsMacrophages, AlveolarProspective StudiesBacterial LoadSerotypingNeutrophilsCoinfectionHospitalizationStreptolysinsMicrobial Sensitivity TestsPulmonary Surfactant-Associated Protein DHaemophilus influenzaeIdiopathic Interstitial PneumoniasPseudomonas InfectionsEnterococcus faecalisMouthBronchoscopyRetrospective StudiesRespiration, ArtificialDNA, BacterialSputumBacteriaLung DiseasesErythromycinAntigens, BacterialPneumococcal VaccinesHIV InfectionsBacterial InfectionsInfluenza A Virus, H1N1 SubtypeAcute DiseaseRisk FactorsIncidenceMurine pneumonia virusPseudomonas aeruginosaPneumocystis jiroveciiDisease Models, AnimalStaphylococcus aureusNasopharynxTreatment OutcomePenicillinsPharyngitisDental PlaquePneumocystisStreptococcus intermediusPenicillin ResistanceMice, Inbred C57BLLung Diseases, FungalDrug Resistance, BacterialAutopsyTime FactorsLegionnaires' DiseaseMacrolidesMycoplasma pneumoniaeRadiography, ThoracicBacteremiaBacterial AdhesionInfluenza A virus