Pneumonia, BacterialPneumoniaPneumonia, PneumococcalPneumonia, ViralPneumonia, PneumocystisPneumonia, StaphylococcalCommunity-Acquired InfectionsLungCryptogenic Organizing PneumoniaPneumonia, Ventilator-AssociatedStreptococcus pneumoniaeKlebsiella InfectionsKlebsiella pneumoniaePneumonia, MycoplasmaBronchoalveolar Lavage FluidEmpiricismTrimethoprim-Sulfamethoxazole CombinationAIDS-Related Opportunistic InfectionsAnti-Bacterial AgentsPneumonia, AspirationInfluenza, HumanOrthomyxoviridae InfectionsSuperinfectionMacrophages, AlveolarPulmonary Surfactant-Associated Protein DCoinfectionPneumonia, LipidHaemophilus InfectionsNeutrophilsBacterial LoadCross InfectionProspective StudiesPneumococcal InfectionsAnti-Infective AgentsHIV InfectionsBronchoscopyHospitalizationPseudomonas InfectionsLung DiseasesInfluenza A Virus, H1N1 SubtypeRespiration, ArtificialLung Diseases, InterstitialAutopsyLung Diseases, FungalSputumRetrospective StudiesCD4 Lymphocyte CountBacterial InfectionsInfluenza A virusMice, Inbred C57BLHaemophilus influenzaeIncidencePseudomonas aeruginosaAcute DiseaseRisk FactorsDisease Models, AnimalTreatment OutcomeIdiopathic Interstitial PneumoniasNeutrophil InfiltrationPulmonary AlveoliCase-Control StudiesNeuraminidaseImmunity, InnateJapanMice, Inbred BALB CDisease OutbreaksComorbidityCytokinesStaphylococcus aureusEscherichia coli InfectionsTime FactorsMurine pneumonia virusChemokinesPneumocystis jiroveciiViral LoadBacteriaPneumocystisAntiretroviral Therapy, Highly ActiveSensitivity and SpecificityCohort StudiesLegionnaires' DiseaseRadiography, ThoracicUnited StatesInterleukin-6Mycoplasma pneumoniaeMice, KnockoutTumor Necrosis Factor-alphaBiological MarkersAnti-HIV AgentsPredictive Value of TestsPulmonary Eosinophilia