BronchitisBronchitis, ChronicPneumoniaInfectious bronchitis virusPneumonia, BacterialPneumonia, ViralPneumonia, PneumococcalCryptogenic Organizing PneumoniaPneumonia, PneumocystisPneumonia, StaphylococcalPneumonia, Ventilator-AssociatedPneumonia, AspirationCommunity-Acquired InfectionsPneumonia, MycoplasmaPneumonia, LipidCoronavirus InfectionsChronic DiseaseCoronaviridaeLungSputumCoughAnti-Bacterial AgentsLung Diseases, InterstitialRespiratory Tract DiseasesRespiratory Tract InfectionsStreptococcus pneumoniaeBronchoalveolar Lavage FluidAcute DiseaseAsthmaIdiopathic Interstitial PneumoniasPoultry DiseasesExpectorantsBronchoscopyPulmonary EmphysemaLung Diseases, ObstructiveSmokingPulmonary Disease, Chronic ObstructiveEmphysemaBronchopneumoniaRadiography, ThoracicRespiratory Function TestsLung DiseasesMurine pneumonia virusPneumocystis jiroveciiMycoplasma pneumoniaePulmonary Heart DiseasePneumocystisHospitalizationAnti-Infective AgentsBronchiProspective StudiesBronchiectasisLegionnaires' DiseaseForced Expiratory VolumeRespiratory SoundsVital CapacityBronchiolitisAirway ObstructionCross InfectionRisk FactorsSpirometryNasopharyngitisTracheitisRetrospective StudiesCoronaviridae InfectionsRespiration DisordersTreatment OutcomeHaemophilus influenzaePulmonary EosinophiliaTrimethoprim-Sulfamethoxazole CombinationDustSeverity of Illness IndexHaemophilus InfectionsCoal MiningFossil FuelsPneumonia, Progressive Interstitial, of SheepCefuroximeFatal OutcomeVentilators, MechanicalBronchoalveolar LavageOccupational DiseasesRespiration, ArtificialPrevalenceChickensInfluenza, HumanWeldingMucociliary ClearanceIntensive Care UnitsTextile IndustryTachypneaTime FactorsPneumoconiosisMucusIncidenceDiagnostic Techniques, Respiratory SystemAge FactorsByssinosisEosinophiliaTracheaIpratropium