Respiratory Tract DiseasesRespiration DisordersFeverRespiratory SoundsCoughDustAsthmaOccupational ExposureQ FeverOccupational DiseasesRespiratory Function TestsBronchitisForced Expiratory VolumeSpirometryVital CapacityRespiratory HypersensitivityAgricultural Workers' DiseasesAir Pollutants, OccupationalYellow FeverTyphoid FeverDyspneaPrevalenceAir Pollution, IndoorInhalation ExposureBronchitis, ChronicBarberingFlourSmokingFever of Unknown OriginQuestionnairesByssinosisHypersensitivity, ImmediateTextile IndustryWeldingRhinitisCross-Sectional StudiesSkin TestsFood-Processing IndustryLung DiseasesPeak Expiratory Flow RateBronchial Provocation TestsAir PollutionMaximal Midexpiratory Flow Rate