Streptococcus pneumoniaePneumonia, BacterialVirulencePneumoniaStreptococcusPneumonia, PneumococcalPneumonia, ViralStreptococcus pyogenesStreptococcus mutansPneumonia, PneumocystisPneumonia, StaphylococcalCommunity-Acquired InfectionsCryptogenic Organizing PneumoniaStreptococcus agalactiaeStreptococcal InfectionsPneumonia, Ventilator-AssociatedAnti-Bacterial AgentsLungPneumonia, MycoplasmaStreptococcus suisPneumonia, AspirationPneumococcal InfectionsStreptococcus bovisKlebsiella pneumoniaeKlebsiella InfectionsStreptococcus mitisBronchoalveolar Lavage FluidStreptococcus equiTrimethoprim-Sulfamethoxazole CombinationStreptococcus oralisPneumonia, LipidBacterial ProteinsStreptococcus sobrinusAIDS-Related Opportunistic InfectionsStreptococcus PhagesEmpiricismAnti-Infective AgentsInfluenza, HumanSerotypingMicrobial Sensitivity TestsCross InfectionStreptococcus gordoniiStreptococcus thermophilusLung Diseases, InterstitialOrthomyxoviridae InfectionsHaemophilus InfectionsDNA, BacterialSuperinfectionMacrophages, AlveolarProspective StudiesBacterial LoadSequence Analysis, DNANeutrophilsHaemophilus influenzaeGenes, BacterialEnterococcus faecalisAntigens, BacterialStreptolysinsCoinfectionSpecies SpecificityPseudomonas InfectionsMouthHospitalizationBacteriaStaphylococcus aureusPulmonary Surfactant-Associated Protein DPseudomonas aeruginosaBacterial Typing TechniquesIdiopathic Interstitial PneumoniasErythromycinMolecular Sequence DataDrug Resistance, BacterialRetrospective StudiesBronchoscopyDisease Models, AnimalBacterial AdhesionRespiration, ArtificialDrug Resistance, MicrobialCulture MediaMice, Inbred C57BLSputumPenicillin ResistancePenicillinsLung DiseasesRNA, Ribosomal, 16STime FactorsBacterial InfectionsInfluenza A Virus, H1N1 SubtypePneumococcal VaccinesHIV InfectionsAcute DiseaseIncidenceRisk FactorsAntibodies, BacterialMice, Inbred BALB CMurine pneumonia virusNasopharynxDisease OutbreaksDental PlaquePharyngitis