BronchitisBronchitis, ChronicInfectious bronchitis virusPrevalenceChronic DiseaseCoronaviridaeCoronavirus InfectionsCross-Sectional StudiesRisk FactorsRespiratory Tract DiseasesSmokingCoughAsthmaSputumAge FactorsPoultry DiseasesRespiratory Tract InfectionsAge DistributionExpectorantsSex FactorsLung Diseases, ObstructiveSex DistributionPulmonary EmphysemaRespiratory SoundsQuestionnairesEmphysemaHealth SurveysPulmonary Disease, Chronic ObstructiveBrazilOccupational DiseasesRespiratory Function TestsAcute DiseaseUnited StatesForced Expiratory VolumePulmonary Heart DiseaseSpirometryLogistic ModelsRespiration DisordersAnti-Bacterial AgentsVital CapacityBronchiectasisDustChinaRural PopulationAirway ObstructionNasopharyngitisSocioeconomic FactorsCoal MiningProspective StudiesUrban PopulationIndiaBronchiIncidenceCoronaviridae InfectionsFossil FuelsOccupational ExposureCohort StudiesRetrospective StudiesTextile IndustryLung DiseasesRural HealthChickensPneumoconiosisComorbidityOdds RatioAgricultural Workers' DiseasesInfant, NewbornByssinosisLungSpainBronchoscopySeverity of Illness IndexTime FactorsEnglandEpidemiologic MethodsMass Chest X-RayCefuroximeTachypneaWeldingCase-Control StudiesIpratropiumMucociliary ClearanceHIV InfectionsMucusJapanEosinophiliaPopulation SurveillanceDrug UtilizationBronchiolitisUrban HealthAtropine DerivativesHaemophilus influenzaePneumoniaAir PollutionForced Expiratory Flow RatesWalesFollow-Up StudiesEczemaPolymerase Chain ReactionChi-Square Distribution