BronchitisBronchitis, ChronicInfectious bronchitis virusAsthmaForced Expiratory VolumeBronchial Provocation TestsBronchiSputumMethacholine ChlorideAdministration, InhalationRespiratory Function TestsBronchial HyperreactivityPeak Expiratory Flow RateAlbuterolChronic DiseaseBronchodilator AgentsAnti-Asthmatic AgentsCoronaviridaeCoronavirus InfectionsSpirometryAirway ResistanceCoughBronchoconstrictor AgentsAirway ObstructionBronchoconstrictionVital CapacityLungAsthma, Exercise-InducedAllergensRespiratory Tract DiseasesEosinophilsHypersensitivity, ImmediateLung Diseases, ObstructiveRespiratory SoundsBudesonideBronchoalveolar Lavage FluidAdrenal Cortex HormonesExpectorantsAerosolsDustRespiratory Tract InfectionsSmokingPoultry DiseasesPulmonary EmphysemaIpratropiumNebulizers and VaporizersBronchoscopyForced Expiratory Flow RatesBeclomethasoneImmunoglobulin EDouble-Blind MethodEosinophiliaAtropine DerivativesPulmonary Disease, Chronic ObstructiveSkin TestsAcute DiseaseEmphysemaMucociliary ClearanceHistamineRespiratory SystemAirway RemodelingBreath TestsBronchiectasisHypersensitivityPulmonary Heart DiseaseMitesSulfur DioxideMethacholine CompoundsOccupational DiseasesRhinitisEosinophil Granule ProteinsExhalationAnti-Inflammatory AgentsRespiratory MucosaNasopharyngitisCromolyn SodiumAntigens, DermatophagoidesRespiration DisordersTracheaMucusAir PollutantsCoronaviridae InfectionsCross-Over StudiesBronchial SpasmAir PollutionCoal MiningMaximal Expiratory Flow RatePrevalenceFossil FuelsTheophyllineOccupational ExposureSeverity of Illness IndexPneumoniaPregnenedionesLung DiseasesCase-Control StudiesInterleukin-5TerbutalineNitrogen DioxideChickens